WO2016194217A1 - Image processing device, computer program, and image processing method - Google Patents

Image processing device, computer program, and image processing method Download PDF

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Publication number
WO2016194217A1
WO2016194217A1 PCT/JP2015/066306 JP2015066306W WO2016194217A1 WO 2016194217 A1 WO2016194217 A1 WO 2016194217A1 JP 2015066306 W JP2015066306 W JP 2015066306W WO 2016194217 A1 WO2016194217 A1 WO 2016194217A1
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WO
WIPO (PCT)
Prior art keywords
image data
color
printing
ink
ink color
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PCT/JP2015/066306
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French (fr)
Japanese (ja)
Inventor
宏 松木
Original Assignee
株式会社ジーティービー
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Priority to PCT/JP2015/066306 priority Critical patent/WO2016194217A1/en
Priority to JP2017521465A priority patent/JPWO2016194217A1/en
Publication of WO2016194217A1 publication Critical patent/WO2016194217A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/52—Arrangement for printing a discrete number of tones, not covered by group B41J2/205, e.g. applicable to two or more kinds of printing or marking process
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T1/00—General purpose image data processing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/56—Processing of colour picture signals
    • H04N1/60—Colour correction or control

Definitions

  • the present invention relates to an image processing apparatus, a computer program, and an image processing method for processing printing image data input to a printing apparatus.
  • Patent Document 1 proposes a technique for confirming a color to be printed, a layout of a print object, and the like by a digital printer such as an ink jet before output on a final printing apparatus.
  • image processing for that purpose, it is described that blurring processing, resolution conversion processing, etc. are performed on a halftone image object for printing, and further, color conversion is performed on the blurred image by using an ICC profile. Has been.
  • the present invention aims at a more complete solution to this problem.
  • the printing device controlled by a computer or the like produces substantially the same color as a printed matter printed by a plate-type printing device, and moiré is generated.
  • the object is to obtain a printed matter in which undesirable visual effects such as edge enhancement are accurately reproduced.
  • the present invention provides an image processing apparatus for generating second printing image data corresponding to a second printing apparatus from first printing image data corresponding to the first printing apparatus.
  • a color setting unit that sets and stores the ink color mixing ratio of the second printing apparatus for each ink color or each ink color overlay pattern; an image data receiving unit that receives the first printing image data; The first print image data is divided into areas for each ink color or each ink color superposition pattern, and mixing according to the mixing ratio of the corresponding ink colors for each divided area.
  • a color conversion unit that assigns colors and performs color conversion; and an image data output unit that generates multi-tone image data for each ink color from the color-converted image data and outputs the data as second print image data.
  • the present invention also provides an image processing apparatus for generating second printing image data corresponding to the second printing apparatus from the first printing image data corresponding to the first printing apparatus.
  • a predetermined number of pixels in accordance with a color setting unit that sets and stores the ink color mixing ratio of the second printing apparatus for each ink color or each ink color overlapping pattern, and the set ink color mixing ratio
  • a color block generation unit that generates a plurality of types of color blocks by assigning one of the ink colors of the second printing apparatus to each pixel of the block in which the image data is arranged, and image data that receives the first printing image data
  • a receiving unit, a region dividing unit that divides the received first printing image data into regions for each ink color or each overlapping pattern of ink colors, and corresponding color blocks are arranged for each divided region
  • a color conversion unit that performs color conversion by generating image data
  • an image data output unit that generates binary image data for each ink color from the color-converted image data and outputs the image data as second print image data
  • the present invention also provides a computer for causing a computer to execute image processing for generating second printing image data corresponding to a second printing device from first printing image data corresponding to the first printing device.
  • the step of setting the ink color mixing ratio of the second printing device for each ink color of the first printing device or each ink color overlay pattern and the first printing value image data are accepted.
  • the present invention also provides a computer for causing a computer to execute image processing for generating second printing image data corresponding to a second printing device from first printing image data corresponding to the first printing device.
  • the present invention also provides an image processing method for generating second printing image data corresponding to a second printing apparatus from first printing image data corresponding to the first printing apparatus.
  • the ink color mixing ratio of the second printing device is set for each ink color or each ink color overlay pattern, the first printing image data is accepted, and the received first printing image data is The image data is divided into regions for each ink color or each overlapping pattern of ink colors, and color conversion is performed by assigning a mixed color according to the mixing ratio of the corresponding ink color for each divided region, and color-converted image data Multi-tone image data for each ink color is generated from the image data and output as second image data for a printing press.
  • the present invention also provides an image processing method for generating second printing image data corresponding to a second printing apparatus from first printing image data corresponding to the first printing apparatus.
  • the ink color mixing ratio of the second printing apparatus is set for each ink color or each ink color overlapping pattern, and a predetermined number of pixels are arranged according to the set ink color mixing ratio.
  • the first printing image data is received, and the received first printing image data is Divide into areas for each ink color or overlay pattern for each ink color, and color conversion is performed by arranging corresponding color blocks for each divided area, and binary for each ink color from the color-converted image data Image data It generates, and outputs as a second printer image data.
  • the color setting data is set so that the color of the printed matter by the first printing device matches the color of the printed matter by the second printing device, and further, the position of the halftone dot in the first printing image data And the shape is carried over to the second printing image data as it is. Therefore, the printed matter that is printed by inputting the second printing image data to the second printing device is substantially the same color as the printed matter that is printed by inputting the first printing image data to the first printing device. And undesirable visual effects such as moiré and edge enhancement are accurately reproduced.
  • the binary image data is in a format that can be easily printed from a plate-type printing device. It can also be used for applications such as printing a printed material that is almost the same as the printed material printed on the printing device by another type of printing device.
  • FIG. 1 is a system diagram illustrating a basic configuration of an image processing apparatus as an example of an embodiment.
  • (A) to (d) show halftone dot image data of C, M, Y, and K constituting the first print image data. It is a table which shows an example of color setting data.
  • FIG. 3 is a diagram showing first print image data superimposed with C, M, Y, and K dot image data.
  • FIG. 6 is a diagram illustrating an example of Y multi-tone image data generated by extracting a Y component from color-converted image data. It is a flowchart which shows the basic composition of the computer program for producing
  • (A) is an example of color setting data
  • (b) is an example of a color block. It is drawing explaining the process which arranges a color block in the area
  • FIG. 1 is a system diagram showing a basic configuration of an image processing apparatus as an example of an embodiment.
  • the first print image data D1 is, for example, cyan (hereinafter referred to as C), magenta (hereinafter referred to as M), yellow (hereinafter referred to as Y), black (hereinafter referred to as K). ) Binary image data and is halftone dot image data.
  • the halftone image data expresses the gradation of each position by adjusting the area of the coloring points (halftone dots) of each ink color regularly arranged in the medium area.
  • FIGS. 2A to 2D are examples of halftone dot image data constituting the first print image data D1, and are C, M, Y, and K halftone dot image data D1 (C) and D1. (M), D1 (Y), and D1 (K) are shown.
  • a color print can be obtained by printing these on a medium in a predetermined order.
  • the halftone dots Q are circular as an example, but may be other shapes.
  • the halftone dots Q are placed on parallel lines with a constant interval as shown by dotted lines in the figure.
  • the angle of the parallel lines is generally called a screen angle and is set differently for each ink color. By changing the screen angle in this way, undesirable visual effects such as moiré and edge enhancement can be suppressed.
  • a plate that can be used repeatedly is produced from the first printing image data D1 by a plate making apparatus (not shown).
  • a plate making apparatus for example, a letterpress, an intaglio, and a lithographic plate.
  • the halftone dots in the plate become the ink adhesion area.
  • the first printing apparatus 10 is assumed to be a plate-type printing apparatus, and the above-described plate is incorporated, and ink is attached to the halftone dots of each plate to form binary images of the respective ink colors. Are transferred to a medium in a predetermined order and overlapped to form a color plate-type printed matter P1.
  • a plate-type printing apparatus is generally used for mass printing in a printing shop or the like.
  • the second print image data D2 is multi-tone image data of C, M, Y, K, for example, and has a format in which pixels (pixels) in which the tone for each ink color is designated are spread over the medium area. is there.
  • the second printing apparatus 20 is assumed to be a plateless printing apparatus controlled by a computer device such as a workstation.
  • the plateless printing apparatus is different from the plate type printing apparatus in that a plate that can be used repeatedly is not used. Typical examples include a toner printer, an ink jet printer, and a sublimation printer.
  • the plateless printing apparatus receives the second printing image data D2, generates unique printing image data by an algorithm specific to the apparatus, and fixes each ink on the medium in a pattern according to the printing image data.
  • the color plateless printed material P2 is formed.
  • the process of generating unique print image data from the second print image data D2 may be performed by the control computer device or by the printing device itself.
  • the image processing device 30 is a device that generates the second printing image data D2 corresponding to the second printing device 20 from the first printing image data D1 corresponding to the first printing device 10.
  • the plate-type printing apparatus that is assumed to be the first printing apparatus 10 needs to create a plate of each ink color for each printed matter, so if the number of printed copies is small, the printing cost per copy is excessive. Become.
  • the plateless printing apparatus that is assumed to be the second printing apparatus 20 does not require a plate, so the printing cost per number of copies is constant. Therefore, if the quality of the printed material printed by the plate-type printing apparatus can be confirmed by performing trial printing on a printed material substantially the same as the printed material using a plateless printing apparatus, the cost of trial printing can be greatly reduced, and the time for producing the plate is not required.
  • the image processing apparatus 30 is intended for such trial printing, and the first printing image data D1 corresponding to the first printing apparatus 10 is converted into the second printing apparatus by original image processing.
  • the second printing image data D2 corresponding to 20 and capable of obtaining substantially the same printed matter is generated.
  • substantially the same here means that not only color reproducibility but also undesirable visual effects such as moiré and edge enhancement are reproduced as well.
  • the image processing apparatus 30 sets the ink color mixing ratio of the second printing apparatus 20 for each ink color overlay pattern of the first printing apparatus 10 and accepts and accepts the first printing image data D1.
  • the first printing image data D1 is divided into regions for each ink color superposition pattern, and color conversion is performed by assigning a mixed color according to the mixing ratio of the corresponding ink color for each divided region, Multi-tone image data for each ink color is generated from the color-converted image data and output as second printing press image data.
  • a color setting unit 31 that sets and stores the ink color mixing ratio of the second printing device 20 for each ink color overlay pattern of the first printing device 10, and the first An image data receiving unit 32 that receives the printing image data D1, a region sorting unit 33 that divides the received first printing image data D1 into regions for each ink color overlay pattern, and for each divided region.
  • a color conversion unit 34 for allocating color conversions according to the corresponding mixing ratio of ink colors, and generating multi-tone image data for each ink color from the color-converted image data, for the second printing
  • an image data output unit 35 that outputs the image data D2.
  • the color setting unit 31 is configured to receive and store the color setting data D3 via a medium such as a communication cable or a memory card, or by operating a keyboard or the like.
  • the color setting data D3 sets the ink colors of the first printing device 10 to the second color so that the color of the printed material by the first printing device 10 and the color of the printed material by the second printing device 20 match.
  • Japan Color 2001 has been defined as a color standard for standard printing, and C, M, Y, K of the first printing device 10 and C, M, Y, K of the second printing device 20 It is considered that the color standard is adjusted.
  • the types of media printed by the first and second printing apparatuses 10 and 20 are different, the color development is expected to be slightly different even with the same ink color. It is thought that it becomes easy to differ.
  • the ink color mixing ratio of the second printing device 20 is set for each ink color overlay pattern of the first printing device 10 as the color setting data D3.
  • the coloration of C on the medium is matched with both.
  • C60%, K5%, etc. mean C 60% gradation and K 5% gradation, respectively.
  • the mixture ratio of C, M, Y, and K in the second printing apparatus 20 is set at the minimum for each color.
  • the effect of bringing the color of the printed matter by the first printing device 10 close to the color of the printed matter by the second printing device 20 can be obtained.
  • the superposition patterns of C, M, Y, and K are limited to a total of 15 patterns, if the mixture ratio of C, M, Y, and K of the second printing apparatus 20 is set for each, the first pattern The color development of the printed matter by the first printing apparatus 10 and the color development of the printed matter by the second printing apparatus 20 can be made closer to each other.
  • the mixing ratio of the ink colors may be set based on the printing order and transparency of the ink colors in the first and second printing apparatuses 10 and 20.
  • a color chart including 15 patterns of ink color superimposition is prepared, and the printed matter by the first printing apparatus 10 and the printed matter by the second printing apparatus 20 are compared, thereby superimposing the ink colors.
  • the mixing ratio of C, M, Y, and K may be determined for each pattern.
  • FIG. 3 is a table showing an example of the color setting data D3.
  • the table also shows examples of specific mixed colors.
  • the image data receiving unit 32 is configured to receive the first print image data D1 from an external device via a medium such as a communication cable or a memory card.
  • the received first printing image data D1 may be subjected to dot gain adjustment processing for enlarging or reducing a part of halftone dots according to a predetermined standard. By performing such dot gain adjustment processing in advance, it is possible to suppress the crushing and skipping of the solid portion caused by the characteristics of the second printing apparatus 20.
  • the region sorting unit 33 superimposes binary image data for each ink color constituting the first printing image data D1, and sorts the superimposed image data into regions for each ink color overlay pattern. Composed. In this area dividing process, each halftone dot is divided into one or a plurality of areas while maintaining the arrangement and shape of each halftone dot.
  • FIG. 4 is an example of such superimposed image data, and the binary image data shown in FIGS. 2 (a) to 2 (d) are superimposed.
  • halftone dot portions that do not overlap with each other halftone dot portions that overlap each other, three halftone dot portions that overlap three times, and four halftone dot portions that overlap each other are divided as regions. become.
  • a superposition pattern CMYK,... K is shown for some areas.
  • the color conversion unit 34 assigns a mixed color according to the mixing ratio of the corresponding ink colors to each of the areas divided as described above. For example, a mixed color in accordance with the ink color mixing ratio C15% + M17% + Y18% + K21% is assigned to the overlapping pattern YMCK area.
  • the spot color can be associated with a specific mixing ratio of C, M, Y, and K of the second printing apparatus 20. is there. In such an association, in the color-converted image, the spot color is decomposed into C, M, Y, and K and does not exist as an ink color.
  • the area dividing unit 33 divides the first print image data D1 into areas of each color of C, M, Y, and K. That is, each of the binary image data of C, M, Y, and K is set as one area.
  • the color conversion unit 34 assigns a mixing ratio to each of the binary image data of C, M, M, and K, and different mixed colors are assigned.
  • the areas are partially overlapped. The mixed colors of the overlapping portions may be added or averaged.
  • the image data output unit 35 extracts each ink color component from the color-converted image data to generate multi-tone image data for each ink color, and uses the multi-tone image data as the second printing image. Output as data D2.
  • the overlay patterns CMYK, CMY, CMK, CYK, MYK, CM, CY, MY, MK, YK, M, and Y are Y components.
  • CK, C, and K do not contain a Y component.
  • the Y multi-tone image data obtained by extracting the Y component from the color-converted image is the overlay pattern CMYK, CMY, CMK, CYK, MYK, CM, CY, MY, MK, YK, M, Y. It has a spread that combines these areas.
  • FIG. 5 shows the spread of such Y multi-tone image data DY. Note that FIG. 5 merely shows the spread, and the gradation in each part is determined by the value of the Y component in each region (not necessarily constant throughout FIG. 5). Although only Y has been described here, the same applies to other ink colors.
  • Such multi-tone image data for each ink color has a format suitable for the second printing apparatus 20 configured as described above.
  • the color setting data D3 is set so that the color of the printed matter by the first printing apparatus 10 and the color of the printed matter by the second printing apparatus 20 are the same, and further, the network in the first printing image data D1.
  • the position and shape of the points are inherited as they are in the second printing image data D2. Therefore, the printed matter printed by inputting the second printing image data D2 to the second printing apparatus 20 is the same as the printed matter printed by inputting the first printing image data D1 to the first printing apparatus 10. Substantially the same color can be obtained, and undesirable visual effects such as moiré and edge enhancement can be accurately reproduced.
  • the image processing apparatus can be configured by a computer such as a workstation.
  • a computer program that causes a computer to execute image processing for generating second printing image data corresponding to the second printing device from the first printing image data corresponding to the first printing device.
  • FIG. 6 is a flowchart showing the basic configuration of such a computer program.
  • step 100 is a step of setting the ink color mixing ratio of the second printing apparatus for each ink color overlay pattern of the first printing apparatus.
  • Step 101 is a step of receiving first print value image data.
  • Step 102 is a step of dividing the received first print image data into regions for each ink color overlay pattern.
  • Step 103 is a step of performing color conversion by assigning a mixed color according to the mixing ratio of the corresponding ink color for each divided area.
  • Step 104 is a step of extracting each ink color component from the color-converted image data to generate multi-tone image data for each ink color.
  • Step 105 is a step of outputting the generated multi-tone image data for each ink color as second print image data.
  • FIG. 7 is a system diagram illustrating a basic configuration of an image processing apparatus as another example of the embodiment. Elements common to FIG. 1 are denoted by the same reference numerals and description thereof is omitted.
  • the first print image data D1 is the same as that in the above embodiment (see FIG. 2).
  • the first printing apparatus 10 is the same as that in the above embodiment, and accepts the first printing image data D1 to form a color plate-type printed matter P1.
  • the second print image data D2 is a combination of binary image data of C, M, Y, K, for example, and a pixel in which two gradations are designated for each of C, M, Y, K
  • This is a format in which (pixels) are spread over the medium area. That is, it is specified that a certain amount of C, M, Y, K ink is applied or not applied to each pixel.
  • the second printing device 20 is assumed to be a plateless printing device controlled by a computer device such as a workstation.
  • This plateless printing apparatus is configured to receive binary image data for each ink color and fix each ink to a medium in a pattern according to the binary image data, thereby forming a color plateless printed material P2.
  • a computer device such as a workstation.
  • This plateless printing apparatus is configured to receive binary image data for each ink color and fix each ink to a medium in a pattern according to the binary image data, thereby forming a color plateless printed material P2.
  • the image processing device 30 is a device that generates the second printing image data D2 corresponding to the second printing device 20 from the first printing image data D1 corresponding to the first printing device 10.
  • the basic configuration is different from the above embodiment.
  • the image processing device 30 sets the ink color mixing ratio of the second printing device 20 for each ink color overlay pattern of the first printing device 10, and according to the set ink color mixing ratio, A plurality of types of color blocks are generated by assigning one of the ink colors of the second printing apparatus 20 to each pixel of a block in which a predetermined number of pixels are arranged (see FIG. 8B), and the first printing is performed.
  • the image data D1 is received, and the received first printing image data D1 is divided into areas for each of the ink color superposition patterns, and a color block is arranged for each of the divided areas.
  • the binary image data for each ink color is generated from the converted and color-converted image data, and is output as the second printing press image data D2.
  • a color setting unit 31 that sets and stores the ink color mixing ratio of the second printing device 20 for each ink color overlay pattern of the first printing device 10 is set.
  • a color block generation unit 36 that generates a plurality of types of color blocks by assigning one of the ink colors of the second printing apparatus 20 to each pixel of a block in which a predetermined number of pixels are arranged according to the mixing ratio of each ink color.
  • An image data receiving unit 32 that receives the first printing image data D1, a region dividing unit 33 that divides the received first printing image data D1 into regions for each of the ink color overlay patterns, A color conversion unit 34 that performs color conversion by arranging corresponding color blocks for each divided area, and binary image data for each ink color is generated from the color-converted image data, and the second mark And an image data output section 35 for outputting a use image data D2.
  • the color setting unit 31 is the same as that in the above embodiment.
  • the color setting data D3 shown in FIG. 8A is the ink color mixture ratio C15% + M17% of the second printing apparatus 20 with respect to the ink color overlay pattern CMYK,... + Y18% + K21%,... K80% are set. Furthermore, reference names of color blocks B (described later) corresponding to the mixing ratio are also shown.
  • This embodiment is characterized in that the mixed color is expressed by a ratio of the number of pixels to which each ink color is assigned in a block in which a predetermined number of pixels are arranged. Therefore, a color block generation unit 36 is provided. Yes.
  • the color block generation unit 36 selects any of the ink colors of the second printing apparatus 20 for each pixel of a block in which a predetermined number of pixels (for example, 7 ⁇ 7 pixels) are arranged according to the set mixing ratio of each ink color. By assigning these, a color block is generated for each mixed color.
  • a color block expresses a single mixed color because pixels appear to be mixed from a distance. Pixels to which ink colors are assigned may be selected randomly or by dithering or the like.
  • FIG. 8B shows an example of color blocks BCMYK,... BK generated for the overlay patterns CMYK,.
  • the color block B is not limited to a single type, and a plurality of types of color blocks B in which the arrangement of pixels is different with respect to the same ink color overlay pattern may be prepared.
  • the color block B may include a white pixel to which no ink color is assigned, that is, can cope with more gradations.
  • the spot color can be associated with a specific mixing ratio of C, M, Y, and K of the second printing apparatus 20. is there. When such association is performed, a color block B corresponding to the spot color is generated, but one of the ink colors of the second printing apparatus 20 is assigned to the pixels constituting the color block B.
  • the spot color does not exist as an ink color.
  • the image data receiving unit 32 is the same as in the above embodiment.
  • the received first printing image data D1 may be subjected to dot gain adjustment processing for enlarging or reducing a part of halftone dots according to a predetermined standard.
  • the area division unit 33 is the same as that in the above embodiment (see FIG. 4).
  • the color conversion unit 34 performs color conversion on each area by arranging the corresponding color blocks B for each divided area.
  • FIG. 9 shows a part of the processing for arranging the color blocks B in the divided areas.
  • the color pattern BCY is arranged in the area of the overlay pattern CY
  • the color block BYK is arranged in the area of the overlay pattern YK
  • the color block BM is arranged in the area of the overlay pattern M.
  • color blocks BY are arranged.
  • the color block B that partially protrudes from the region may be left as it is, or the protruding portion may be deleted.
  • the area classification unit 33 also divides the first print image data D1 into areas of C, M, Y, and K colors. That is, each of the binary image data of C, M, Y, and K is set as one area.
  • the color conversion unit 34 arranges the color block BC over the entire binary image data of C, arranges the color block BM over the entire binary image data of M, and Y
  • the color block BC is arranged over the entire binary image data
  • the color block BK is arranged over the entire binary image data of K.
  • a part of the color blocks BC, BM, BY, BK arranged in this way is overlapped.
  • the image data output unit 35 extracts pixels of each ink color from the color-converted image data, generates binary image data for each ink color, and uses the binary image data as second printing image data D2. Output.
  • FIG. 10 shows an example of Y binary image data generated by extracting Y pixels from color-converted image data.
  • the color blocks BCK, BC, and BK do not include Y pixels. Therefore, the binary image data DY of Y is obtained by combining the overlapping patterns CMYK, CMY, CMK, CYK, MYK, CM, CY, MY, MK, YK, M, and Y in which color blocks including Y pixels are arranged. Has a wide spread.
  • the distribution of Y pixels in each part of the binary image data DY of Y is a color block BCMYK corresponding to the overlay pattern CMYK, CMY, CMK, CYK, MYK, CM, CY, MY, MK, YK, M, Y,. Is determined by the arrangement of Y pixels in (not constant as a whole).
  • monochrome blocks BM (Y) and BY (Y) obtained by extracting Y pixels from the color blocks BM and BY are illustrated. Although only Y has been described here, the same applies to other ink colors.
  • Such a binary image for each ink color has a format suitable for the second printing apparatus 20 configured as described above.
  • the color setting data D3 is set so that the color of the first printing device 10 and the color of the second printing device 20 match, and the position of the halftone dot in the first printing image data D1, The shape is inherited as it is in the second printing image data D2. Therefore, the printed matter printed by inputting the second printing image data D2 to the second printing apparatus 20 is the same as the printed matter printed by inputting the first printing image data D1 to the first printing apparatus 10. Substantially the same color can be obtained, and undesirable visual effects such as moiré and edge enhancement can be accurately reproduced.
  • this binary image for each ink color can regard each pixel as a halftone dot, it can be easily printed on a plate-type printing apparatus without any special processing. Therefore, it can also be used for applications such as printing a printed material that is substantially the same as a printed material printed by a certain type of printing apparatus using another type of printing apparatus.
  • the image processing apparatus can be configured by a computer such as a workstation.
  • a computer program that causes a computer to execute image processing for generating second printing image data corresponding to the second printing device from the first printing image data corresponding to the first printing device.
  • FIG. 11 is a flowchart showing the basic configuration of such a computer program.
  • step 200 is a step of setting the ink color mixing ratio of the second printing apparatus for each ink color overlay pattern of the first printing apparatus.
  • Step 201 assigns a plurality of types of color blocks by assigning one of the ink colors of the second printing apparatus to each pixel of the block in which a predetermined number of pixels are arranged according to the set mixing ratio of each ink color.
  • Step 202 is a step of accepting first print image data.
  • Step 203 is a step of dividing the received first print image data into regions for each ink color overlay pattern.
  • Step 204 is a step of performing color conversion by arranging corresponding color blocks for each divided area.
  • Step 205 is a step of extracting each ink color pixel from the color-converted image data to generate binary image data for each ink color.
  • Step 206 is a step of outputting the generated binary image data for each ink color as second print image data.

Abstract

According to the present invention, it is possible to obtain printed matter, using a printing device controlled by a computer or the like, which has approximately the same coloring as in printed matter printed using a plate printing device, and in which moire, edge enhancement, and other undesirable visual effects are accurately reproduced. An image processing device 30 according to the present invention is provided with a color setting unit 31 for setting and storing a mixing ratio of ink colors of a second printing device 20 for each ink color or each overlay pattern of ink colors of a first printing device 10, an image data acceptance unit 32 for accepting first printing image data D1, a region dividing unit 33 for dividing the accepted first printing image data into regions for each ink color or each overlay pattern of ink colors, a color conversion unit 34 for assigning a mixed color that conforms to the corresponding mix ratio of ink colors and performing color conversion for each of the divided regions, and an image data output unit 35 for generating multilevel grayscale image data for each ink color from the color-converted image data and outputting the generated data as second printing image data D2.

Description

画像処理装置、コンピュータ用プログラム及び画像処理方法Image processing apparatus, computer program, and image processing method
　本発明は、印刷装置に入力される印刷用画像データを処理する画像処理装置、コンピュータ用プログラム及び画像処理方法に関する。 The present invention relates to an image processing apparatus, a computer program, and an image processing method for processing printing image data input to a printing apparatus.
　版式印刷装置で高品位な印刷物を印刷しようとすると、本番印刷でモアレ等の発生がなく期待通りに発色することを、事前に試し印刷等で検証する必要がある（プルーフ作業）。しかしながら版式印刷装置で試し印刷する場合、そのための版を作製する必要があるのでコストが過大になってしまうという問題があった。 When trying to print high-quality printed matter with a plate-type printing device, it is necessary to verify in advance by trial printing or the like that there is no moiré or the like in production printing and color development is expected as expected (proof work). However, when trial printing is performed with a plate-type printing apparatus, there is a problem in that the cost is excessive because it is necessary to prepare a plate for that purpose.
　そのような問題に着目した従来技術として例えば次の特許文献１がある。その文献では、最終的な印刷本機での出力の前に、印刷される色や印刷オブジェクトのレイアウトなどをインクジェット等のデジタルプリンタによって確認する技術が提案されている。そのための画像処理では、印刷用の網点画像のオブジェクトに対してぼかし処理、解像度変換処理等を行うこと、更にぼかし処理された画画像に対してＩＣＣプロファイルを用いて色変換すること等が記載されている。 For example, there is the following Patent Document 1 as a prior art focusing on such a problem. The document proposes a technique for confirming a color to be printed, a layout of a print object, and the like by a digital printer such as an ink jet before output on a final printing apparatus. In the image processing for that purpose, it is described that blurring processing, resolution conversion processing, etc. are performed on a halftone image object for printing, and further, color conversion is performed on the blurred image by using an ICC profile. Has been.
特開２０１５－０２３３７８号公報Japanese Patent Laying-Open No. 2015-023378
　しかしながら引用文献１に記載の画像処理では、網点の配置や形状がそのまま保たれるわけではないのでモアレの検証が確実性に欠ける、またＩＣＣプロファイルを用いた色変換ではインクが重なり合う部分に対して色の正確さに疑問がある等、問題が完全に解決されているわけではなかった。 However, in the image processing described in Cited Document 1, the arrangement and shape of the halftone dots are not maintained as they are, and therefore the moire verification is not sure, and in the color conversion using the ICC profile, the ink overlaps the overlapping portion. The problem was not completely solved, such as the question of color accuracy.
　本発明は、この問題のより完全な解決を目的としたものであり、コンピュータ等で制御される印刷装置によって、版式印刷装置で印刷された印刷物と略同一の発色であり、かつモアレの発生やエッジの強調等の望ましくない視覚効果も正確に再現される印刷物が得られるようにすることを目的としている。 The present invention aims at a more complete solution to this problem. The printing device controlled by a computer or the like produces substantially the same color as a printed matter printed by a plate-type printing device, and moiré is generated. The object is to obtain a printed matter in which undesirable visual effects such as edge enhancement are accurately reproduced.
　本発明は、第一の印刷装置に対応した第一の印刷用画像データから、第二の印刷装置に対応した第二の印刷用画像データを生成する画像処理装置において、第一の印刷装置のインク色毎又はインク色の重ね合わせパターン毎に、第二の印刷装置のインク色の混合比を設定し記憶する色設定部と、第一の印刷用画像データを受け入れる画像データ受入部と、受け入れた第一の印刷用画像データを、前記インク色毎又はインク色の重ね合わせパターン毎の領域に区分する領域区分部と、区分された領域毎に、対応したインク色の混合比に従った混合色を割り当てて色変換する色変換部と、色変換された画像データからインク色毎の多階調画像データを生成し、第二の印刷用画像データとして出力する画像データ出力部とを備えることを特徴とする。 The present invention provides an image processing apparatus for generating second printing image data corresponding to a second printing apparatus from first printing image data corresponding to the first printing apparatus. A color setting unit that sets and stores the ink color mixing ratio of the second printing apparatus for each ink color or each ink color overlay pattern; an image data receiving unit that receives the first printing image data; The first print image data is divided into areas for each ink color or each ink color superposition pattern, and mixing according to the mixing ratio of the corresponding ink colors for each divided area. A color conversion unit that assigns colors and performs color conversion; and an image data output unit that generates multi-tone image data for each ink color from the color-converted image data and outputs the data as second print image data. Features .
　また本発明は、第一の印刷装置に対応した第一の印刷用画像データから、第二の印刷装置に対応した第二の印刷用画像データを生成する画像処理装置において、第一の印刷装置のインク色毎又はインク色の重ね合わせパターン毎に、第二の印刷装置のインク色の混合比を設定し記憶する色設定部と、設定された各インク色の混合比に従って、所定数の画素を配列させたブロックの各画素に第二の印刷装置のインク色のいずれかを割り当てることで、複数種別の色ブロックを生成する色ブロック生成部と、第一の印刷用画像データを受け入れる画像データ受入部と、受け入れた第一の印刷用画像データを、前記インク色毎又はインク色の重ね合わせパターン毎の領域に区分する領域区分部と、区分された領域毎に、対応した色ブロックを配列させることで色変換する色変換部と、色変換された画像データからインク色毎の二値画像データを生成し、第二の印刷用画像データとして出力する画像データ出力部とを備えることを特徴とする。 The present invention also provides an image processing apparatus for generating second printing image data corresponding to the second printing apparatus from the first printing image data corresponding to the first printing apparatus. A predetermined number of pixels in accordance with a color setting unit that sets and stores the ink color mixing ratio of the second printing apparatus for each ink color or each ink color overlapping pattern, and the set ink color mixing ratio A color block generation unit that generates a plurality of types of color blocks by assigning one of the ink colors of the second printing apparatus to each pixel of the block in which the image data is arranged, and image data that receives the first printing image data A receiving unit, a region dividing unit that divides the received first printing image data into regions for each ink color or each overlapping pattern of ink colors, and corresponding color blocks are arranged for each divided region A color conversion unit that performs color conversion by generating image data, and an image data output unit that generates binary image data for each ink color from the color-converted image data and outputs the image data as second print image data. And
　また本発明は、第一の印刷装置に対応した第一の印刷用画像データから、第二の印刷装置に対応した第二の印刷用画像データを生成する画像処理をコンピュータに実行させるためのコンピュータ用プログラムにおいて、第一の印刷装置のインク色毎又はインク色の重ね合わせパターン毎に、第二の印刷装置のインク色の混合比を設定する工程と、第一の印刷用値画像データを受け入れる工程と、受け入れた第一の印刷用画像データを、前記インク色毎又はインク色の重ね合わせパターン毎の領域に区分する工程と、区分された領域毎に、対応したインク色の混合比に従った混合色を割り当てて色変換する工程と、色変換された画像データからインク色毎の多階調画像データを生成する工程と、生成されたインク色毎の多階調画像データを、第二の印刷用画像データとして出力する工程とを備えることを特徴とする。 The present invention also provides a computer for causing a computer to execute image processing for generating second printing image data corresponding to a second printing device from first printing image data corresponding to the first printing device. In the printing program, the step of setting the ink color mixing ratio of the second printing device for each ink color of the first printing device or each ink color overlay pattern and the first printing value image data are accepted. A step of dividing the received first printing image data into regions for each ink color or each overlapping pattern of ink colors, and a mixing ratio of ink colors corresponding to each divided region. Assigning the mixed colors and performing color conversion, generating multi-tone image data for each ink color from the color-converted image data, and generating multi-tone image data for each ink color, Characterized in that it comprises a step of outputting a second image data for printing.
　また本発明は、第一の印刷装置に対応した第一の印刷用画像データから、第二の印刷装置に対応した第二の印刷用画像データを生成する画像処理をコンピュータに実行させるためのコンピュータ用プログラムにおいて、第一の印刷装置のインク色毎又はインク色の重ね合わせパターン毎に、第二の印刷装置のインク色の混合比を設定する工程と、設定された各インク色の混合比に従って、所定数の画素を配列させたブロックの各画素に第二の印刷装置のインク色のいずれかを割り当てることで、複数種別の色ブロックを生成する工程と、第一の印刷用画像データを受け入れる工程と、受け入れた第一の印刷用画像データを、前記インク色毎又はインク色の重ね合わせパターン毎の領域に区分する工程と、区分された領域毎に、対応した色ブロックを配列させることで色変換する工程と、色変換された画像データからインク色毎の二値画像データを生成する工程と、生成されたインク色毎の二値画像データを、第二の印刷用画像データとして出力する工程とを備えることを特徴とする。 The present invention also provides a computer for causing a computer to execute image processing for generating second printing image data corresponding to a second printing device from first printing image data corresponding to the first printing device. Program for setting the ink color mixing ratio of the second printing device for each ink color or ink color overlay pattern of the first printing device, and according to the set ink color mixing ratio , And assigning one of the ink colors of the second printing apparatus to each pixel of the block in which a predetermined number of pixels are arranged, and accepting the first printing image data A step of dividing the received first printing image data into regions for each ink color or each overlapping pattern of ink colors, and a color block corresponding to each divided region. A step of performing color conversion by arranging the colors, a step of generating binary image data for each ink color from the color-converted image data, and a binary image data for each generated ink color. And a step of outputting as print image data.
　また本発明は、第一の印刷装置に対応した第一の印刷用画像データから、第二の印刷装置に対応した第二の印刷用画像データを生成する画像処理方法において、第一の印刷装置のインク色毎又はインク色の重ね合わせパターン毎に、第二の印刷装置のインク色の混合比を設定し、第一の印刷用画像データを受け入れ、受け入れた第一の印刷用画像データを、前記インク色毎又はインク色の重ね合わせパターン毎の領域に区分し、区分された領域毎に、対応したインク色の混合比に従った混合色を割り当てて色変換し、色変換された画像データからインク色毎の多階調画像データを生成し、第二の印刷機用画像データとして出力することを特徴とする。 The present invention also provides an image processing method for generating second printing image data corresponding to a second printing apparatus from first printing image data corresponding to the first printing apparatus. The ink color mixing ratio of the second printing device is set for each ink color or each ink color overlay pattern, the first printing image data is accepted, and the received first printing image data is The image data is divided into regions for each ink color or each overlapping pattern of ink colors, and color conversion is performed by assigning a mixed color according to the mixing ratio of the corresponding ink color for each divided region, and color-converted image data Multi-tone image data for each ink color is generated from the image data and output as second image data for a printing press.
　また本発明は、第一の印刷装置に対応した第一の印刷用画像データから、第二の印刷装置に対応した第二の印刷用画像データを生成する画像処理方法において、第一の印刷装置のインク色毎又はインク色の重ね合わせパターン毎に、第二の印刷装置のインク色の混合比を設定し、設定された各インク色の混合比に従って、所定数の画素を配列させたブロックの各画素に第二の印刷装置のインク色のいずれかを割り当てることで、複数種別の色ブロックを生成し、第一の印刷用画像データを受け入れ、受け入れた第一の印刷用画像データを、前記インク色又はインク色毎の重ね合わせパターン毎の領域に区分し、区分された領域毎に、対応した色ブロックを配列させることで色変換し、色変換された画像データからインク色毎の二値画像データを生成し、第二の印刷機用画像データとして出力することを特徴とする。 The present invention also provides an image processing method for generating second printing image data corresponding to a second printing apparatus from first printing image data corresponding to the first printing apparatus. The ink color mixing ratio of the second printing apparatus is set for each ink color or each ink color overlapping pattern, and a predetermined number of pixels are arranged according to the set ink color mixing ratio. By assigning one of the ink colors of the second printing device to each pixel, a plurality of types of color blocks are generated, the first printing image data is received, and the received first printing image data is Divide into areas for each ink color or overlay pattern for each ink color, and color conversion is performed by arranging corresponding color blocks for each divided area, and binary for each ink color from the color-converted image data Image data It generates, and outputs as a second printer image data.
　本発明では、第一の印刷装置による印刷物の発色と、第二の印刷装置による印刷物の発色とが一致するように色設定データが設定され、更に第一の印刷用画像データにおける網点の位置及び形状は第二の印刷用画像データにそのまま引き継がれる。よって第二の印刷用画像データを第二の印刷装置に入力して印刷された印刷物は、第一の印刷用画像データを第一の印刷装置に入力して印刷される印刷物と略同一の発色が得られ、モアレの発生やエッジの強調等の望ましくない視覚効果も正確に再現される。 In the present invention, the color setting data is set so that the color of the printed matter by the first printing device matches the color of the printed matter by the second printing device, and further, the position of the halftone dot in the first printing image data And the shape is carried over to the second printing image data as it is. Therefore, the printed matter that is printed by inputting the second printing image data to the second printing device is substantially the same color as the printed matter that is printed by inputting the first printing image data to the first printing device. And undesirable visual effects such as moiré and edge enhancement are accurately reproduced.
　またインク色毎の二値画像データを、第二の印刷用画像データとして出力する構成では、その二値画像データは版式印刷装置からでも簡単に印刷できる形式になっているので、ある機種の版式印刷装置で印刷される印刷物と略同一の印刷物を他の機種の版式印刷装置によって印刷させるというような用途にも活用できる In the configuration in which binary image data for each ink color is output as second print image data, the binary image data is in a format that can be easily printed from a plate-type printing device. It can also be used for applications such as printing a printed material that is almost the same as the printed material printed on the printing device by another type of printing device.
実施形態の一例とされる画像処理装置の基本構成を示すシステム図である。1 is a system diagram illustrating a basic configuration of an image processing apparatus as an example of an embodiment. （ａ）～（ｄ）はそれぞれ第一の印刷用画像データを構成するＣ、Ｍ、Ｙ、Ｋの網点画像データを示している。(A) to (d) show halftone dot image data of C, M, Y, and K constituting the first print image data. 色設定データの一例を示すテーブルである。It is a table which shows an example of color setting data. 第一の印刷用画像データを、Ｃ、Ｍ、Ｙ、Ｋの網点画像データを重ね合わせて示した図面である。FIG. 3 is a diagram showing first print image data superimposed with C, M, Y, and K dot image data. FIG. 色変換された画像データからＹ成分を抽出して生成されたＹの多階調画像データの例を示す図面である。6 is a diagram illustrating an example of Y multi-tone image data generated by extracting a Y component from color-converted image data. 多階調画像データを生成するためのコンピュータ用プログラムの基本構成を示すフローチャートである。It is a flowchart which shows the basic composition of the computer program for producing | generating multi-tone image data. 実施形態の他例とされる画像処理装置の基本構成を示すシステム図である。It is a system diagram which shows the basic composition of the image processing apparatus used as the other example of embodiment. （ａ）は色設定データの一例、（ｂ）は色ブロックの例である。(A) is an example of color setting data, and (b) is an example of a color block. 区分された領域に色ブロックを配列させる処理を説明する図面である。It is drawing explaining the process which arranges a color block in the area | region divided. 色変換された画像データからＹ画素を抽出して生成されたＹの二値画像データの例を示している。An example of Y binary image data generated by extracting Y pixels from color-converted image data is shown. 二値画像データを生成するためのコンピュータ用プログラムの基本構成を示すフローチャートである。It is a flowchart which shows the basic composition of the program for computers for producing | generating binary image data.
　図１は、実施形態の一例とされる画像処理装置の基本構成を示すシステム図である。 FIG. 1 is a system diagram showing a basic configuration of an image processing apparatus as an example of an embodiment.
　第一の印刷用画像データＤ１は、例えば、シアン（以後はＣと記載する）、マゼンタ（以後はＭと記載する）、イエロー（以後はＹと記載する）、ブラック（以後はＫと記載する）の二値画像データを組み合わせたものであり、網点画像データになっている。網点画像データは、媒体領域に規則的に配列された各インク色の着色点（網点）の面積を調節することで各位置の階調を表現する。 The first print image data D1 is, for example, cyan (hereinafter referred to as C), magenta (hereinafter referred to as M), yellow (hereinafter referred to as Y), black (hereinafter referred to as K). ) Binary image data and is halftone dot image data. The halftone image data expresses the gradation of each position by adjusting the area of the coloring points (halftone dots) of each ink color regularly arranged in the medium area.
　図２（ａ）～（ｄ）は、第一の印刷用画像データＤ１を構成する網点画像データの一例であり、それぞれＣ、Ｍ、Ｙ、Ｋの網点画像データＤ１（Ｃ）、Ｄ１（Ｍ）、Ｄ１（Ｙ）、Ｄ１（Ｋ）を示している。これらを所定の順序で媒体に印刷することでカラー印刷物が得られる。網点Ｑは一例として円形としているが、他の形状であってもよい。網点Ｑは図中の点線のように一定間隔の平行線上に置かれる。この平行線の角度は一般にスクリーン角度と呼ばれるものでインク色毎に違えて設定されている。このようにスクリーン角度を違えることで、モアレの発生やエッジの強調等の望ましくない視覚効果が抑えられる。 FIGS. 2A to 2D are examples of halftone dot image data constituting the first print image data D1, and are C, M, Y, and K halftone dot image data D1 (C) and D1. (M), D1 (Y), and D1 (K) are shown. A color print can be obtained by printing these on a medium in a predetermined order. The halftone dots Q are circular as an example, but may be other shapes. The halftone dots Q are placed on parallel lines with a constant interval as shown by dotted lines in the figure. The angle of the parallel lines is generally called a screen angle and is set differently for each ink color. By changing the screen angle in this way, undesirable visual effects such as moiré and edge enhancement can be suppressed.
　第一の印刷用画像データＤ１から、図示しない製版装置等によって、繰り返し使用可能な版が作製される。例えば凸版、凹版、平版等である。版における網点はインクの付着領域になる。 A plate that can be used repeatedly is produced from the first printing image data D1 by a plate making apparatus (not shown). For example, a letterpress, an intaglio, and a lithographic plate. The halftone dots in the plate become the ink adhesion area.
　第一の印刷装置１０は版式印刷装置と想定しており、前記のような版が組み込まれ、各版の網点にインクを付着させて各インク色の二値画像を形成し、それらの画像を所定の順番で媒体に転写して重ね合わせることで、カラーの版式印刷物Ｐ１を形成するように構成されている。版式印刷装置は一般に印刷所等で大量印刷する用途に使われるものである。 The first printing apparatus 10 is assumed to be a plate-type printing apparatus, and the above-described plate is incorporated, and ink is attached to the halftone dots of each plate to form binary images of the respective ink colors. Are transferred to a medium in a predetermined order and overlapped to form a color plate-type printed matter P1. A plate-type printing apparatus is generally used for mass printing in a printing shop or the like.
　第二の印刷用画像データＤ２は、例えばＣ、Ｍ、Ｙ、Ｋの多階調画像データであって、インク色毎の階調が指定された画素（ピクセル）を媒体領域に敷きつめた形式である。 The second print image data D2 is multi-tone image data of C, M, Y, K, for example, and has a format in which pixels (pixels) in which the tone for each ink color is designated are spread over the medium area. is there.
　第二の印刷装置２０はワークステーション等のコンピュータ装置によって制御される無版印刷装置と想定している。無版印刷装置は、繰り返し使用可能な版を用いない点で版式印刷装置と相違する。代表的なものとしてトナー式プリンタ、インクジェット式プリンタ、昇華式プリンタ等がある。
　無版印刷装置は、第二の印刷用画像データＤ２を受け入れて、装置固有のアルゴリズムによって独自の印刷画像データを生成し、その印刷画像データに従ったパターンで各インクを媒体に定着させることで、カラーの無版印刷物Ｐ２を形成するように構成されている。第二の印刷用画像データＤ２から独自の印刷画像データを生成する処理は、制御用のコンピュータ装置で行っても、印刷装置自身で行ってもよい。 The second printing apparatus 20 is assumed to be a plateless printing apparatus controlled by a computer device such as a workstation. The plateless printing apparatus is different from the plate type printing apparatus in that a plate that can be used repeatedly is not used. Typical examples include a toner printer, an ink jet printer, and a sublimation printer.
The plateless printing apparatus receives the second printing image data D2, generates unique printing image data by an algorithm specific to the apparatus, and fixes each ink on the medium in a pattern according to the printing image data. The color plateless printed material P2 is formed. The process of generating unique print image data from the second print image data D2 may be performed by the control computer device or by the printing device itself.
　画像処理装置３０は、第一の印刷装置１０に対応した第一の印刷用画像データＤ１から、第二の印刷装置２０に対応した第二の印刷用画像データＤ２を生成する装置である。 The image processing device 30 is a device that generates the second printing image data D2 corresponding to the second printing device 20 from the first printing image data D1 corresponding to the first printing device 10.
　より詳細に云えば、第一の印刷装置１０と想定している版式印刷装置は、印刷物毎に各インク色の版を作成する必要があるので、印刷部数が少ないと部数当りの印刷コストが過大になってしまう。これに対して第二の印刷装置２０と想定している無版印刷装置は、版を必要としないので、部数当りの印刷コストは一定である。よって版式印刷装置で印刷する印刷物の出来栄えを、その印刷物と略同一の印刷物を無版印刷装置によって試し印刷して確認できれば、試し刷りコストが大幅に削減でき、また版の作製時間も必要なくなる。 More specifically, the plate-type printing apparatus that is assumed to be the first printing apparatus 10 needs to create a plate of each ink color for each printed matter, so if the number of printed copies is small, the printing cost per copy is excessive. Become. On the other hand, the plateless printing apparatus that is assumed to be the second printing apparatus 20 does not require a plate, so the printing cost per number of copies is constant. Therefore, if the quality of the printed material printed by the plate-type printing apparatus can be confirmed by performing trial printing on a printed material substantially the same as the printed material using a plateless printing apparatus, the cost of trial printing can be greatly reduced, and the time for producing the plate is not required.
　画像処理装置３０は、そのような試し印刷を意図としたものであって、独自の画像処理により、第一の印刷装置１０に対応した第一の印刷用画像データＤ１から、第二の印刷装置２０に対応し、かつ略同一の印刷物が得られる第二の印刷用画像データＤ２を生成する。ここに略同一は、色の再現性はもちろん、モアレの発生やエッジの強調等の望ましくない視覚効果も同様に再現されることを意味している。 The image processing apparatus 30 is intended for such trial printing, and the first printing image data D1 corresponding to the first printing apparatus 10 is converted into the second printing apparatus by original image processing. The second printing image data D2 corresponding to 20 and capable of obtaining substantially the same printed matter is generated. Substantially the same here means that not only color reproducibility but also undesirable visual effects such as moiré and edge enhancement are reproduced as well.
　画像処理装置３０は、第一の印刷装置１０のインク色の重ね合わせパターン毎に、第二の印刷装置２０のインク色の混合比を設定し、第一の印刷用画像データＤ１を受け入れ、受け入れた第一の印刷用画像データＤ１を、インク色の重ね合わせパターン毎の領域に区分し、区分された領域毎に、対応したインク色の混合比に従った混合色を割り当てて色変換し、色変換された画像データからインク色毎の多階調画像データを生成し、第二の印刷機用画像データとして出力するように構成される。 The image processing apparatus 30 sets the ink color mixing ratio of the second printing apparatus 20 for each ink color overlay pattern of the first printing apparatus 10 and accepts and accepts the first printing image data D1. The first printing image data D1 is divided into regions for each ink color superposition pattern, and color conversion is performed by assigning a mixed color according to the mixing ratio of the corresponding ink color for each divided region, Multi-tone image data for each ink color is generated from the color-converted image data and output as second printing press image data.
　そのための基本的な要素として、第一の印刷装置１０のインク色の重ね合わせパターン毎に、第二の印刷装置２０のインク色の混合比を設定し記憶する色設定部３１と、第一の印刷用画像データＤ１を受け入れる画像データ受入部３２と、受け入れた第一の印刷用画像データＤ１を、インク色の重ね合わせパターン毎の領域に区分する領域区分部３３と、区分された領域毎に、対応したインク色の混合比に従った混合色を割り当てて色変換する色変換部３４と、色変換された画像データからインク色毎の多階調画像データを生成し、第二の印刷用画像データＤ２として出力する画像データ出力部３５とを備える。
　以下、これらの要素とその作用について詳細に説明する。 As a basic element for that purpose, a color setting unit 31 that sets and stores the ink color mixing ratio of the second printing device 20 for each ink color overlay pattern of the first printing device 10, and the first An image data receiving unit 32 that receives the printing image data D1, a region sorting unit 33 that divides the received first printing image data D1 into regions for each ink color overlay pattern, and for each divided region. A color conversion unit 34 for allocating color conversions according to the corresponding mixing ratio of ink colors, and generating multi-tone image data for each ink color from the color-converted image data, for the second printing And an image data output unit 35 that outputs the image data D2.
Hereinafter, these elements and their actions will be described in detail.
　色設定部３１は通信ケーブルあるいはメモリカード等の媒体を介して、又はキーボード等の操作によって色設定データＤ３を受け入れて記憶するように構成される。 The color setting unit 31 is configured to receive and store the color setting data D3 via a medium such as a communication cable or a memory card, or by operating a keyboard or the like.
　色設定データＤ３は、要するに第一の印刷装置１０による印刷物の発色と、第二の印刷装置２０による印刷物の発色とが一致するように、第一の印刷装置１０の各インク色を、第二の印刷装置２０のインク色の特定の混合比に対応づける設定データである。近時、標準印刷の色基準としてＪａｐａｎ　Ｃｏｌｏｒ　２００１が規定されており、第一の印刷装置１０のＣ、Ｍ、Ｙ、Ｋも、第二の印刷装置２０のＣ、Ｍ、Ｙ、Ｋも、その色基準に合致するように調整されていると考えられる。しかしながら第一、第二の印刷装置１０、２０で印刷される媒体の種別が異なれば、同一のインク色であっても発色が微妙に異なることが予想され、インク色の重なり部分では発色が更に異なり易くなると考えられる。 In short, the color setting data D3 sets the ink colors of the first printing device 10 to the second color so that the color of the printed material by the first printing device 10 and the color of the printed material by the second printing device 20 match. Is setting data associated with a specific mixing ratio of ink colors of the printing apparatus 20. Recently, Japan Color 2001 has been defined as a color standard for standard printing, and C, M, Y, K of the first printing device 10 and C, M, Y, K of the second printing device 20 It is considered that the color standard is adjusted. However, if the types of media printed by the first and second printing apparatuses 10 and 20 are different, the color development is expected to be slightly different even with the same ink color. It is thought that it becomes easy to differ.
　そこで本実施形態では色設定データＤ３として、第一の印刷装置１０のインク色の重ね合わせパターン毎に、第二の印刷装置２０のインク色の混合比を設定する。例えば第一の印刷装置１０のＣに対して、第二の印刷装置２０のＣ６０％＋Ｋ５％の混合比を設定する等して、媒体上のＣの発色を両者で一致させる。ここにＣ６０％、Ｋ５％等はそれぞれＣの６０％階調、Ｋの５％階調という意味である。 Therefore, in this embodiment, the ink color mixing ratio of the second printing device 20 is set for each ink color overlay pattern of the first printing device 10 as the color setting data D3. For example, by setting a mixing ratio of C 60% + K 5% of the second printing apparatus 20 with respect to C of the first printing apparatus 10, the coloration of C on the medium is matched with both. Here, C60%, K5%, etc. mean C 60% gradation and K 5% gradation, respectively.
　第一の印刷装置１０でＣ、Ｍ、Ｙ、Ｋの網点を用いる場合、最低限、その各色に対して第二の印刷装置２０のＣ、Ｍ、Ｙ、Ｋの混合比を設定すれば、第一の印刷装置１０による印刷物の発色と第二の印刷装置２０による印刷物の発色とを近づける効果が得られる。しかしながらＣ、Ｍ、Ｙ、Ｋの重ね合わせパターンは合計１５パターンに限定されるから、そのそれぞれに対して第二の印刷装置２０のＣ、Ｍ、Ｙ、Ｋの混合比を設定すれば、第一の印刷装置１０による印刷物の発色と第二の印刷装置２０による印刷物の発色とを更に近づけることが可能になる。その際、インク色の混合比は、第一、第二の印刷装置１０、２０におけるインク色の印刷順序と透過度とに基づいて設定するとよい。あるいはインク色の重ね合わせ１５パターンを含ませたカラーチャートを用意し、第一の印刷装置１０によるその印刷物と、第二の印刷装置２０によるその印刷物とを対比することで、インク色の重ね合わせパターン毎にＣ、Ｍ、Ｙ、Ｋの混合比を決定してもよい。 When C, M, Y, and K halftone dots are used in the first printing apparatus 10, the mixture ratio of C, M, Y, and K in the second printing apparatus 20 is set at the minimum for each color. Thus, the effect of bringing the color of the printed matter by the first printing device 10 close to the color of the printed matter by the second printing device 20 can be obtained. However, since the superposition patterns of C, M, Y, and K are limited to a total of 15 patterns, if the mixture ratio of C, M, Y, and K of the second printing apparatus 20 is set for each, the first pattern The color development of the printed matter by the first printing apparatus 10 and the color development of the printed matter by the second printing apparatus 20 can be made closer to each other. At that time, the mixing ratio of the ink colors may be set based on the printing order and transparency of the ink colors in the first and second printing apparatuses 10 and 20. Alternatively, a color chart including 15 patterns of ink color superimposition is prepared, and the printed matter by the first printing apparatus 10 and the printed matter by the second printing apparatus 20 are compared, thereby superimposing the ink colors. The mixing ratio of C, M, Y, and K may be determined for each pattern.
　図３は色設定データＤ３の一例を示すテーブルである。このテーブルでは、第一の印刷装置１０のインク色の重ね合わせパターンＣＭＹＫ、…Ｋに対して、第二の印刷装置２０のインク色の混合比Ｃ１５％＋Ｍ１７％＋Ｙ１８％＋Ｋ２１％、…Ｋ８０％がそれぞれ設定されている。なお参考のため、テーブルには具体的な混合色の例も示している。 FIG. 3 is a table showing an example of the color setting data D3. In this table, the ink color mixture ratio C15% + M17% + Y18% + K21%,... K80% of the second printing apparatus 20 with respect to the ink color overlay pattern CMYK,. Each is set. For reference, the table also shows examples of specific mixed colors.
　画像データ受入部３２は、通信ケーブルあるいはメモリカード等の媒体を介して、外部機器から第一の印刷用画像データＤ１を受け入れるように構成される。受け入れた第一の印刷用画像データＤ１は、網点の一部を、所定基準に従って拡大又は縮小するドットゲイン調整処理を施してもよい。予めそのようなドットゲイン調整処理を施すことにより、第二の印刷装置２０の特性によって生じるベタ部分の潰れや飛びを抑えることができる。 The image data receiving unit 32 is configured to receive the first print image data D1 from an external device via a medium such as a communication cable or a memory card. The received first printing image data D1 may be subjected to dot gain adjustment processing for enlarging or reducing a part of halftone dots according to a predetermined standard. By performing such dot gain adjustment processing in advance, it is possible to suppress the crushing and skipping of the solid portion caused by the characteristics of the second printing apparatus 20.
　領域区分部３３は、第一の印刷用画像データＤ１を構成するインク色毎の二値画像データを重ね合わせ、その重ね合わせ画像データを、インク色の重ね合わせパターン毎の領域に区分するように構成される。この領域区分処理では、各網点の配置及び形状を保ったまま、各網点を１乃至複数の領域に区分する。 The region sorting unit 33 superimposes binary image data for each ink color constituting the first printing image data D1, and sorts the superimposed image data into regions for each ink color overlay pattern. Composed. In this area dividing process, each halftone dot is divided into one or a plurality of areas while maintaining the arrangement and shape of each halftone dot.
　図４はそのような重ね合わせ画像データの一例であり、図２（ａ）～（ｄ）に示した二値画像データを重ね合わせている。図示のように、他と重ならない網点部分、２重に重なり合った網点部分、３重に重なりあった網点部分、４重に重なりあった網点部分の各々がそれぞれ領域として区切られることになる。参考のため一部の領域について重ね合わせパターンＣＭＹＫ、…Ｋを示している。 FIG. 4 is an example of such superimposed image data, and the binary image data shown in FIGS. 2 (a) to 2 (d) are superimposed. As shown in the figure, halftone dot portions that do not overlap with each other, halftone dot portions that overlap each other, three halftone dot portions that overlap three times, and four halftone dot portions that overlap each other are divided as regions. become. For reference, a superposition pattern CMYK,... K is shown for some areas.
　色変換部３４は、前記のように区分された各領域に、対応したインク色の混合比に従った混合色を割り当てる。例えば重ね合わせパターンＹＭＣＫの領域には、インク色の混合比Ｃ１５％＋Ｍ１７％＋Ｙ１８％＋Ｋ２１％に従った混合色を割り当てる。 The color conversion unit 34 assigns a mixed color according to the mixing ratio of the corresponding ink colors to each of the areas divided as described above. For example, a mixed color in accordance with the ink color mixing ratio C15% + M17% + Y18% + K21% is assigned to the overlapping pattern YMCK area.
　なお第一の印刷用画像データＤ１が特色の網点を含んでいる場合、その特色も、第二の印刷装置２０のＣ、Ｍ、Ｙ、Ｋの特定の混合比に対応づけることが可能である。そのような対応づけをした場合、色変換された画像ではその特色はＣ、Ｍ、Ｙ、Ｋに分解されインク色としては存在しなくなる。 When the first printing image data D1 includes a halftone dot, the spot color can be associated with a specific mixing ratio of C, M, Y, and K of the second printing apparatus 20. is there. In such an association, in the color-converted image, the spot color is decomposed into C, M, Y, and K and does not exist as an ink color.
　なお色設定データＤ３において、第一の印刷装置１０のインク色毎に、つまりＣ、Ｍ、Ｙ、Ｋの各色に対してのみ第二の印刷装置２０のインク色の混合比を設定した場合、領域区分部３３は、第一の印刷用画像データＤ１を、Ｃ、Ｍ、Ｙ、Ｋの各色の領域に区分する。すなわち、Ｃ、Ｍ、Ｙ、Ｋの二値画像データの各々がそれぞれ１つの領域とされる。このような領域の区分がなされたとき、色変換部３４は、Ｃ、Ｍ、Ｍ、Ｋの二値画像データの各々に１つずつ混合比を割り当てることになり、異なる混合色が割り当てられた領域同士が部分的に重なり合った状態になる。重なり合った部分の混合色は加算又は平均化するとよい。 In the color setting data D3, when the ink color mixing ratio of the second printing device 20 is set only for each ink color of the first printing device 10, that is, for each color of C, M, Y, and K, The area dividing unit 33 divides the first print image data D1 into areas of each color of C, M, Y, and K. That is, each of the binary image data of C, M, Y, and K is set as one area. When such area division is performed, the color conversion unit 34 assigns a mixing ratio to each of the binary image data of C, M, M, and K, and different mixed colors are assigned. The areas are partially overlapped. The mixed colors of the overlapping portions may be added or averaged.
　画像データ出力部３５は、色変換された画像データから各インク色の成分を抽出してインク色毎の多階調画像データを生成し、その多階調画像データを、第二の印刷用画像データＤ２として出力する。
　例えば図３に示す色設定データＤ３では、重ね合わせパターンＣＭＹＫ、…Ｋの内、重ね合わせパターンＣＭＹＫ、ＣＭＹ、ＣＭＫ、ＣＹＫ、ＭＹＫ、ＣＭ、ＣＹ、ＭＹ、ＭＫ、ＹＫ、Ｍ、ＹはＹ成分を含んでおり、ＣＫ、Ｃ、ＫはＹ成分を含んでいない。したがって色変換された画像からＹ成分を抽出して得られるＹの多階調画像データは、重ね合わせパターンＣＭＹＫ、ＣＭＹ、ＣＭＫ、ＣＹＫ、ＭＹＫ、ＣＭ、ＣＹ、ＭＹ、ＭＫ、ＹＫ、Ｍ、Ｙの領域を合わせた広がりを有する。
　図５は、そのようなＹの多階調画像データＤＹの広がりを示している。なお図５は単に広がりを示しているだけであり、その各部における階調は、各領域のＹ成分の値によって定められる（図５全体で一定ということではない）。
　ここではＹについてのみ説明したが、他のインク色についても同様である。 The image data output unit 35 extracts each ink color component from the color-converted image data to generate multi-tone image data for each ink color, and uses the multi-tone image data as the second printing image. Output as data D2.
For example, in the color setting data D3 shown in FIG. 3, among the overlay patterns CMYK,... K, the overlay patterns CMYK, CMY, CMK, CYK, MYK, CM, CY, MY, MK, YK, M, and Y are Y components. And CK, C, and K do not contain a Y component. Therefore, the Y multi-tone image data obtained by extracting the Y component from the color-converted image is the overlay pattern CMYK, CMY, CMK, CYK, MYK, CM, CY, MY, MK, YK, M, Y. It has a spread that combines these areas.
FIG. 5 shows the spread of such Y multi-tone image data DY. Note that FIG. 5 merely shows the spread, and the gradation in each part is determined by the value of the Y component in each region (not necessarily constant throughout FIG. 5).
Although only Y has been described here, the same applies to other ink colors.
　このようなインク色毎の多階調画像データは、前記のように構成された第二の印刷装置２０に適合する形式になっている。そして第一の印刷装置１０による印刷物の発色と、第二の印刷装置２０による印刷物の発色とが一致するように色設定データＤ３が設定されており、更に第一の印刷用画像データＤ１における網点の位置及び形状は第二の印刷用画像データＤ２にそのまま引き継がれている。よって第二の印刷用画像データＤ２を第二の印刷装置２０に入力して印刷された印刷物は、第一の印刷用画像データＤ１を第一の印刷装置１０に入力して印刷される印刷物と略同一の発色が得られ、モアレの発生やエッジの強調等の望ましくない視覚効果も正確に再現される。 Such multi-tone image data for each ink color has a format suitable for the second printing apparatus 20 configured as described above. The color setting data D3 is set so that the color of the printed matter by the first printing apparatus 10 and the color of the printed matter by the second printing apparatus 20 are the same, and further, the network in the first printing image data D1. The position and shape of the points are inherited as they are in the second printing image data D2. Therefore, the printed matter printed by inputting the second printing image data D2 to the second printing apparatus 20 is the same as the printed matter printed by inputting the first printing image data D1 to the first printing apparatus 10. Substantially the same color can be obtained, and undesirable visual effects such as moiré and edge enhancement can be accurately reproduced.
　画像処理装置は、例えばワークステーション等のコンピュータによって構成できる。そうした場合、第一の印刷装置に対応した第一の印刷用画像データから、第二の印刷装置に対応した第二の印刷用画像データを生成する画像処理をコンピュータに実行させるコンピュータ用プログラムが必要とされる。
　図６はそのようなコンピュータ用プログラムの基本構成を示すフローチャートである。
　基本手順中、ステップ１００は、第一の印刷装置のインク色の重ね合わせパターン毎に、第二の印刷装置のインク色の混合比を設定する工程である。
　ステップ１０１は、第一の印刷用値画像データを受け入れる工程である。
　ステップ１０２は、受け入れた第一の印刷用画像データを、インク色の重ね合わせパターン毎の領域に区分する工程である。
　ステップ１０３は、区分された領域毎に、対応したインク色の混合比に従った混合色を割り当てて色変換する工程である。
　ステップ１０４は、色変換された画像データから各インク色の成分を抽出してインク色毎の多階調画像データを生成する工程である。
　ステップ１０５は、生成されたインク色毎の多階調画像データを、第二の印刷用画像データとして出力する工程である。 The image processing apparatus can be configured by a computer such as a workstation. In such a case, there is a need for a computer program that causes a computer to execute image processing for generating second printing image data corresponding to the second printing device from the first printing image data corresponding to the first printing device. It is said.
FIG. 6 is a flowchart showing the basic configuration of such a computer program.
In the basic procedure, step 100 is a step of setting the ink color mixing ratio of the second printing apparatus for each ink color overlay pattern of the first printing apparatus.
Step 101 is a step of receiving first print value image data.
Step 102 is a step of dividing the received first print image data into regions for each ink color overlay pattern.
Step 103 is a step of performing color conversion by assigning a mixed color according to the mixing ratio of the corresponding ink color for each divided area.
Step 104 is a step of extracting each ink color component from the color-converted image data to generate multi-tone image data for each ink color.
Step 105 is a step of outputting the generated multi-tone image data for each ink color as second print image data.
　次いで実施形態の他例を説明する。
　図７は、実施形態の他例とされる画像処理装置の基本構成を示すシステム図である。図１に共通する要素には同一の参照符号を付けて説明を省略する。 Next, another example of the embodiment will be described.
FIG. 7 is a system diagram illustrating a basic configuration of an image processing apparatus as another example of the embodiment. Elements common to FIG. 1 are denoted by the same reference numerals and description thereof is omitted.
　第一の印刷用画像データＤ１は、前記実施形態と同様である（図２参照）。 The first print image data D1 is the same as that in the above embodiment (see FIG. 2).
　第一の印刷装置１０は、前記実施形態と同様であり、第一の印刷用画像データＤ１を受け入れてカラーの版式印刷物Ｐ１を形成する。 The first printing apparatus 10 is the same as that in the above embodiment, and accepts the first printing image data D1 to form a color plate-type printed matter P1.
　第二の印刷用画像データＤ２は例えばＣ、Ｍ、Ｙ、Ｋの二値画像データを組み合わせたものであって、Ｃ、Ｍ、Ｙ、Ｋの各々に対して２階調が指定された画素（ピクセル）を媒体領域に敷きつめた形式である。すなわち画素の各々について、一定量のＣ、Ｍ、Ｙ、Ｋのインクを打つ／打たないが指定されている。 The second print image data D2 is a combination of binary image data of C, M, Y, K, for example, and a pixel in which two gradations are designated for each of C, M, Y, K This is a format in which (pixels) are spread over the medium area. That is, it is specified that a certain amount of C, M, Y, K ink is applied or not applied to each pixel.
　第二の印刷装置２０はワークステーション等のコンピュータ装置によって制御される無版印刷装置と想定している。この無版印刷装置は、インク色毎の二値画像データを受け入れ、その二値画像データに従ったパターンで各インクを媒体に定着させることで、カラーの無版印刷物Ｐ２を形成するように構成されている。つまり前記実施形態よりも低レベルな印刷制御が可能である。 The second printing device 20 is assumed to be a plateless printing device controlled by a computer device such as a workstation. This plateless printing apparatus is configured to receive binary image data for each ink color and fix each ink to a medium in a pattern according to the binary image data, thereby forming a color plateless printed material P2. Has been. That is, it is possible to perform printing control at a lower level than in the above embodiment.
　画像処理装置３０は、第一の印刷装置１０に対応した第一の印刷用画像データＤ１から、第二の印刷装置２０に対応した第二の印刷用画像データＤ２を生成する装置であるが、前記実施形態とは基本構成が異なる。 The image processing device 30 is a device that generates the second printing image data D2 corresponding to the second printing device 20 from the first printing image data D1 corresponding to the first printing device 10. The basic configuration is different from the above embodiment.
　すなわち画像処理装置３０は、第一の印刷装置１０のインク色の重ね合わせパターン毎に、第二の印刷装置２０のインク色の混合比を設定し、設定された各インク色の混合比に従って、所定数の画素を配列させたブロックの各画素に第二の印刷装置２０のインク色のいずれかを割り当てることで複数種別の色ブロックを生成し（図８（ｂ）参照）、第一の印刷用画像データＤ１を受け入れ、受け入れた第一の印刷用画像データＤ１を、前記インク色の重ね合わせパターン毎の領域に区分し、区分された領域毎に、対応した色ブロックを配列させることで色変換し、色変換された画像データからインク色毎の二値画像データを生成し、第二の印刷機用画像データＤ２として出力するように構成されている。 That is, the image processing device 30 sets the ink color mixing ratio of the second printing device 20 for each ink color overlay pattern of the first printing device 10, and according to the set ink color mixing ratio, A plurality of types of color blocks are generated by assigning one of the ink colors of the second printing apparatus 20 to each pixel of a block in which a predetermined number of pixels are arranged (see FIG. 8B), and the first printing is performed. The image data D1 is received, and the received first printing image data D1 is divided into areas for each of the ink color superposition patterns, and a color block is arranged for each of the divided areas. The binary image data for each ink color is generated from the converted and color-converted image data, and is output as the second printing press image data D2.
　そのための基本的な要素として、第一の印刷装置１０のインク色の重ね合わせパターン毎に、第二の印刷装置２０のインク色の混合比を設定し記憶する色設定部３１と、設定された各インク色の混合比に従って、所定数の画素を配列させたブロックの各画素に第二の印刷装置２０のインク色のいずれかを割り当てることで複数種別の色ブロックを生成する色ブロック生成部３６と、第一の印刷用画像データＤ１を受け入れる画像データ受入部３２と、受け入れた第一の印刷用画像データＤ１を、前記インク色の重ね合わせパターン毎の領域に区分する領域区分部３３と、区分された領域毎に、対応した色ブロックを配列させることで色変換する色変換部３４と、色変換された画像データからインク色毎の二値画像データを生成し、第二の印刷用画像データＤ２として出力する画像データ出力部３５とを備える。 As a basic element for that purpose, a color setting unit 31 that sets and stores the ink color mixing ratio of the second printing device 20 for each ink color overlay pattern of the first printing device 10 is set. A color block generation unit 36 that generates a plurality of types of color blocks by assigning one of the ink colors of the second printing apparatus 20 to each pixel of a block in which a predetermined number of pixels are arranged according to the mixing ratio of each ink color. An image data receiving unit 32 that receives the first printing image data D1, a region dividing unit 33 that divides the received first printing image data D1 into regions for each of the ink color overlay patterns, A color conversion unit 34 that performs color conversion by arranging corresponding color blocks for each divided area, and binary image data for each ink color is generated from the color-converted image data, and the second mark And an image data output section 35 for outputting a use image data D2.
　色設定部３１は、前記実施形態と同様である。 The color setting unit 31 is the same as that in the above embodiment.
　図８（ａ）に示す色設定データＤ３は、第一の印刷装置１０のインク色の重ね合わせパターンＣＭＹＫ、…Ｋに対して、第二の印刷装置２０のインク色の混合比Ｃ１５％＋Ｍ１７％＋Ｙ１８％＋Ｋ２１％、…Ｋ８０％がそれぞれ設定されている。更に、それらの混合比に対応する色ブロックＢ（後述）の参照名も示している。 The color setting data D3 shown in FIG. 8A is the ink color mixture ratio C15% + M17% of the second printing apparatus 20 with respect to the ink color overlay pattern CMYK,... + Y18% + K21%,... K80% are set. Furthermore, reference names of color blocks B (described later) corresponding to the mixing ratio are also shown.
　この実施形態は、混合色を、所定数の画素を配列させたブロック中の各インク色が割り当てられた画素数の比率によって表現する点が特徴であり、そのため色ブロック生成部３６が設けられている。 This embodiment is characterized in that the mixed color is expressed by a ratio of the number of pixels to which each ink color is assigned in a block in which a predetermined number of pixels are arranged. Therefore, a color block generation unit 36 is provided. Yes.
　色ブロック生成部３６は、設定された各インク色の混合比に従って、所定数の画素（例えば７×７画素）を配列させたブロックの各画素に、第二の印刷装置２０のインク色のいずれかを割り当てることで、混合色毎に色ブロックを生成する。色ブロックは遠方からは画素が混じり合って見えることで、一つの混合色を表現する。インク色を割り当てる画素はランダムに選択しても、ディザ等によって選択してもよい。
　図８（ｂ）は、重ね合わせパターンＣＭＹＫ、…Ｋに対して生成される色ブロックＢＣＭＹＫ、…ＢＫの例である。ただし色ブロックＢは一通りに限定されず、同一のインク色の重ね合わせパターンに対して画素の配置を異ならせた複数種類の色ブロックＢを用意してもよい。また色ブロックＢは、インク色が割り当てられない、つまり白色の画素を含めてもよく、そうすればより多くの階調に対応できる。 The color block generation unit 36 selects any of the ink colors of the second printing apparatus 20 for each pixel of a block in which a predetermined number of pixels (for example, 7 × 7 pixels) are arranged according to the set mixing ratio of each ink color. By assigning these, a color block is generated for each mixed color. A color block expresses a single mixed color because pixels appear to be mixed from a distance. Pixels to which ink colors are assigned may be selected randomly or by dithering or the like.
FIG. 8B shows an example of color blocks BCMYK,... BK generated for the overlay patterns CMYK,. However, the color block B is not limited to a single type, and a plurality of types of color blocks B in which the arrangement of pixels is different with respect to the same ink color overlay pattern may be prepared. In addition, the color block B may include a white pixel to which no ink color is assigned, that is, can cope with more gradations.
　なお第一の印刷用画像データＤ１が特色の網点を含んでいる場合、その特色も、第二の印刷装置２０のＣ、Ｍ、Ｙ、Ｋの特定の混合比に対応づけることが可能である。そのような対応づけをした場合、特色に対応した色ブロックＢが生成されるが、その色ブロックＢを構成する画素には第二の印刷装置２０のインク色のいずれかが割り当てられるので、その特色はインク色としては存在しなくなる。 When the first printing image data D1 includes a halftone dot, the spot color can be associated with a specific mixing ratio of C, M, Y, and K of the second printing apparatus 20. is there. When such association is performed, a color block B corresponding to the spot color is generated, but one of the ink colors of the second printing apparatus 20 is assigned to the pixels constituting the color block B. The spot color does not exist as an ink color.
　画像データ受入部３２は、前記実施形態と同様である。なお受け入れた第一の印刷用画像データＤ１は、網点の一部を、所定基準に従って拡大又は縮小するドットゲイン調整処理を施してもよい。 The image data receiving unit 32 is the same as in the above embodiment. The received first printing image data D1 may be subjected to dot gain adjustment processing for enlarging or reducing a part of halftone dots according to a predetermined standard.
　領域区分部３３は、前記実施形態と同様である（図４参照）。 The area division unit 33 is the same as that in the above embodiment (see FIG. 4).
　色変換部３４は、区分された領域毎に、対応した色ブロックＢを配列させることで各領域を色変換する。
　図９は、区分された領域に色ブロックＢを配列させる処理の一部を示している。例えば図示のように、重ね合わせパターンＣＹの領域は色ブロックＢＣＹが配列され、重ね合わせパターンＹＫの領域は色ブロックＢＹＫが配列され、重ね合わせパターンＭの領域は色ブロックＢＭが配列され、重ね合わせパターンＹの領域は色ブロックＢＹが配列される。領域から一部はみ出す色ブロックＢはそのままにしてもよいし、はみ出し部分を削除してもよい。 The color conversion unit 34 performs color conversion on each area by arranging the corresponding color blocks B for each divided area.
FIG. 9 shows a part of the processing for arranging the color blocks B in the divided areas. For example, as shown in the figure, the color pattern BCY is arranged in the area of the overlay pattern CY, the color block BYK is arranged in the area of the overlay pattern YK, and the color block BM is arranged in the area of the overlay pattern M. In the pattern Y area, color blocks BY are arranged. The color block B that partially protrudes from the region may be left as it is, or the protruding portion may be deleted.
　なお色設定データＤ３において、第一の印刷装置１０のインク色毎に、つまりＣ、Ｍ、Ｙ、Ｋの各色に対してのみ第二の印刷装置２０のインク色の混合比を設定した場合、それらの混合比に対応して、色ブロックＢＣ、ＢＭ、ＢＹ、ＢＫが生成される。また領域区分部３３は、第一の印刷用画像データＤ１を、Ｃ、Ｍ、Ｙ、Ｋの各色の領域に区分する。すなわち、Ｃ、Ｍ、Ｙ、Ｋの二値画像データの各々がそれぞれ１つの領域とされる。このような領域の区分がなされたとき、色変換部３４は、Ｃの二値画像データの全体に色ブロックＢＣを配列させ、Ｍの二値画像データの全体に色ブロックＢＭを配列させ、Ｙの二値画像データの全体に色ブロックＢＣを配列させ、Ｋの二値画像データの全体に色ブロックＢＫを配列させる。こうして配列された色ブロックＢＣ、ＢＭ、ＢＹ、ＢＫの一部は重なり合った状態になる。 In the color setting data D3, when the ink color mixing ratio of the second printing device 20 is set only for each ink color of the first printing device 10, that is, for each color of C, M, Y, and K, Color blocks BC, BM, BY, BK are generated corresponding to the mixing ratio. The area classification unit 33 also divides the first print image data D1 into areas of C, M, Y, and K colors. That is, each of the binary image data of C, M, Y, and K is set as one area. When such area division is performed, the color conversion unit 34 arranges the color block BC over the entire binary image data of C, arranges the color block BM over the entire binary image data of M, and Y The color block BC is arranged over the entire binary image data, and the color block BK is arranged over the entire binary image data of K. A part of the color blocks BC, BM, BY, BK arranged in this way is overlapped.
　画像データ出力部３５は、色変換された画像データから各インク色の画素を抽出してインク色毎の二値画像データを生成し、その二値画像データを第二の印刷用画像データＤ２として出力する。 The image data output unit 35 extracts pixels of each ink color from the color-converted image data, generates binary image data for each ink color, and uses the binary image data as second printing image data D2. Output.
　図１０は、色変換された画像データからＹ画素を抽出して生成されたＹの二値画像データの例を示している。図８（ｂ）に示した１５通りの色ブロックＢＣＹＫ、…Ｋの内、色ブロックＢＣＭＹＫ、ＢＣＭＹ、ＢＣＭＫ、ＢＣＹＫ、ＢＭＹＫ、ＢＣＭ、ＢＣＹ、ＢＭＹ、ＢＭＫ、ＢＹＫ、ＢＭ、ＢＹはＹ画素を含んでおり、色ブロックＢＣＫ、ＢＣ、ＢＫはＹ画素を含んでいない。そのためＹの二値画像データＤＹは、Ｙ画素を含む色ブロックが配列された重ね合わせパターンＣＭＹＫ、ＣＭＹ、ＣＭＫ、ＣＹＫ、ＭＹＫ、ＣＭ、ＣＹ、ＭＹ、ＭＫ、ＹＫ、Ｍ、Ｙの領域を合わせた広がりを有する。Ｙの二値画像データＤＹの各部におけるＹ画素の分布は、重ね合わせパターンＣＭＹＫ、ＣＭＹ、ＣＭＫ、ＣＹＫ、ＭＹＫ、ＣＭ、ＣＹ、ＭＹ、ＭＫ、ＹＫ、Ｍ、Ｙに対応した色ブロックＢＣＭＹＫ、…におけるＹ画素の配置によって定められる（全体で一定ということではない）。ここでは参考のため、色ブロックＢＭ、ＢＹからＹ画素を抽出した単色ブロックＢＭ（Ｙ）、ＢＹ（Ｙ）を例示している。
　ここではＹについてのみ説明したが、他のインク色についても同様である。 FIG. 10 shows an example of Y binary image data generated by extracting Y pixels from color-converted image data. Of the 15 color blocks BCYK,..., K shown in FIG. The color blocks BCK, BC, and BK do not include Y pixels. Therefore, the binary image data DY of Y is obtained by combining the overlapping patterns CMYK, CMY, CMK, CYK, MYK, CM, CY, MY, MK, YK, M, and Y in which color blocks including Y pixels are arranged. Has a wide spread. The distribution of Y pixels in each part of the binary image data DY of Y is a color block BCMYK corresponding to the overlay pattern CMYK, CMY, CMK, CYK, MYK, CM, CY, MY, MK, YK, M, Y,. Is determined by the arrangement of Y pixels in (not constant as a whole). Here, for reference, monochrome blocks BM (Y) and BY (Y) obtained by extracting Y pixels from the color blocks BM and BY are illustrated.
Although only Y has been described here, the same applies to other ink colors.
　このようなインク色毎の二値画像は、前記のように構成された第二の印刷装置２０に適合する形式になっている。そして第一の印刷装置１０の発色と、第二の印刷装置２０の発色とが一致するように色設定データＤ３が設定されており、更に第一の印刷用画像データＤ１における網点の位置、形状は第二の印刷用画像データＤ２にそのまま引き継がれている。よって第二の印刷用画像データＤ２を第二の印刷装置２０に入力して印刷された印刷物は、第一の印刷用画像データＤ１を第一の印刷装置１０に入力して印刷される印刷物と略同一の発色が得られ、モアレの発生やエッジの強調等の望ましくない視覚効果も正確に再現される。 Such a binary image for each ink color has a format suitable for the second printing apparatus 20 configured as described above. The color setting data D3 is set so that the color of the first printing device 10 and the color of the second printing device 20 match, and the position of the halftone dot in the first printing image data D1, The shape is inherited as it is in the second printing image data D2. Therefore, the printed matter printed by inputting the second printing image data D2 to the second printing apparatus 20 is the same as the printed matter printed by inputting the first printing image data D1 to the first printing apparatus 10. Substantially the same color can be obtained, and undesirable visual effects such as moiré and edge enhancement can be accurately reproduced.
　またこのインク色毎の二値画像は、各画素を網点と見なすことができるので、特段の加工処理をせずに、版式印刷装置でも簡単に印刷できる。したがって、ある機種の版式印刷装置で印刷される印刷物と略同一の印刷物を他機種の版式印刷装置によって印刷させるというような用途にも活用できる。 In addition, since this binary image for each ink color can regard each pixel as a halftone dot, it can be easily printed on a plate-type printing apparatus without any special processing. Therefore, it can also be used for applications such as printing a printed material that is substantially the same as a printed material printed by a certain type of printing apparatus using another type of printing apparatus.
　画像処理装置は、例えばワークステーション等のコンピュータによって構成できる。そうした場合、第一の印刷装置に対応した第一の印刷用画像データから、第二の印刷装置に対応した第二の印刷用画像データを生成する画像処理をコンピュータに実行させるコンピュータ用プログラムが必要とされる。
　図１１はそのようなコンピュータ用プログラムの基本構成を示すフローチャートである。
　基本手順中、ステップ２００は、第一の印刷装置のインク色の重ね合わせパターン毎に、第二の印刷装置のインク色の混合比を設定する工程である。
　ステップ２０１は、設定された各インク色の混合比に従って、所定数の画素を配列させたブロックの各画素に第二の印刷装置のインク色のいずれかを割り当てることで、複数種別の色ブロックを生成する工程である。
　ステップ２０２は、第一の印刷用画像データを受け入れる工程である。
　ステップ２０３は、受け入れた第一の印刷用画像データを、インク色の重ね合わせパターン毎の領域に区分する工程である。
　ステップ２０４は、区分された領域毎に、対応した色ブロックを配列させることで色変換する工程である。
　ステップ２０５は、色変換された画像データから各インク色の画素を抽出してインク色毎の二値画像データを生成する工程である。
　ステップ２０６は、生成されたインク色毎の二値画像データを、第二の印刷用画像データとして出力する工程である。 The image processing apparatus can be configured by a computer such as a workstation. In such a case, there is a need for a computer program that causes a computer to execute image processing for generating second printing image data corresponding to the second printing device from the first printing image data corresponding to the first printing device. It is said.
FIG. 11 is a flowchart showing the basic configuration of such a computer program.
In the basic procedure, step 200 is a step of setting the ink color mixing ratio of the second printing apparatus for each ink color overlay pattern of the first printing apparatus.
Step 201 assigns a plurality of types of color blocks by assigning one of the ink colors of the second printing apparatus to each pixel of the block in which a predetermined number of pixels are arranged according to the set mixing ratio of each ink color. It is a process of generating.
Step 202 is a step of accepting first print image data.
Step 203 is a step of dividing the received first print image data into regions for each ink color overlay pattern.
Step 204 is a step of performing color conversion by arranging corresponding color blocks for each divided area.
Step 205 is a step of extracting each ink color pixel from the color-converted image data to generate binary image data for each ink color.
Step 206 is a step of outputting the generated binary image data for each ink color as second print image data.
　　　１０　　　第一の印刷装置
　　　２０　　　第二の印刷装置
　　　３０　　　画像処理装置
　　　３１　　　色設定部
　　　３２　　　画像データ受入部
　　　３３　　　領域区分部
　　　３４　　　色変換部
　　　３５　　　画像データ出力部
　　　３６　　　色ブロック生成部
　　　Ｄ１　　　第一の印刷用画像データ
　　　Ｄ２　　　第二の印刷用画像データ
　　　Ｑ　　　　網点
  DESCRIPTION OF SYMBOLS 10 1st printing apparatus 20 2nd printing apparatus 30 Image processing apparatus 31 Color setting part 32 Image data reception part 33 Area | region classification part 34 Color conversion part 35 Image data output part 36 Color block generation part D1 1st image for printing Data D2 Second print image data Q Halftone dot

Claims (15)

  1. 第一の印刷装置に対応した第一の印刷用画像データから、第二の印刷装置に対応した第二の印刷用画像データを生成する画像処理装置において、
    第一の印刷装置のインク色毎又はインク色の重ね合わせパターン毎に、第二の印刷装置のインク色の混合比を設定し記憶する色設定部と、
    第一の印刷用画像データを受け入れる画像データ受入部と、
    受け入れた第一の印刷用画像データを、前記インク色毎又はインク色の重ね合わせパターン毎の領域に区分する領域区分部と、
    区分された領域毎に、対応したインク色の混合比に従った混合色を割り当てて色変換する色変換部と、
    色変換された画像データからインク色毎の多階調画像データを生成し、第二の印刷用画像データとして出力する画像データ出力部とを備えることを特徴とする画像処理装置。     In an image processing apparatus that generates second printing image data corresponding to the second printing apparatus from first printing image data corresponding to the first printing apparatus,
    A color setting unit that sets and stores a mixing ratio of ink colors of the second printing device for each ink color of the first printing device or for each overlapping pattern of ink colors;
    An image data receiving unit for receiving the first print image data;
    An area dividing unit for dividing the received first printing image data into areas for each ink color or for each ink color overlay pattern;
    A color conversion unit that performs color conversion by assigning a mixed color according to a mixing ratio of corresponding ink colors for each divided area;
    An image processing apparatus comprising: an image data output unit that generates multi-tone image data for each ink color from color-converted image data and outputs the data as second print image data.
  2. 第一の印刷装置に対応した第一の印刷用画像データから、第二の印刷装置に対応した第二の印刷用画像データを生成する画像処理装置において、
    第一の印刷装置のインク色毎又はインク色の重ね合わせパターン毎に、第二の印刷装置のインク色の混合比を設定し記憶する色設定部と、
    設定された各インク色の混合比に従って、所定数の画素を配列させたブロックの各画素に第二の印刷装置のインク色のいずれかを割り当てることで、複数種別の色ブロックを生成する色ブロック生成部と、
    第一の印刷用画像データを受け入れる画像データ受入部と、
    受け入れた第一の印刷用画像データを、前記インク色毎又はインク色の重ね合わせパターン毎の領域に区分する領域区分部と、
    区分された領域毎に、対応した色ブロックを配列させることで色変換する色変換部と、
    色変換された画像データからインク色毎の二値画像データを生成し、第二の印刷用画像データとして出力する画像データ出力部とを備えることを特徴とする画像処理装置。     In an image processing apparatus that generates second printing image data corresponding to the second printing apparatus from first printing image data corresponding to the first printing apparatus,
    A color setting unit that sets and stores a mixing ratio of ink colors of the second printing device for each ink color of the first printing device or for each overlapping pattern of ink colors;
    A color block that generates a plurality of types of color blocks by assigning one of the ink colors of the second printing apparatus to each pixel of a block in which a predetermined number of pixels are arranged according to the set mixing ratio of each ink color A generator,
    An image data receiving unit for receiving the first print image data;
    An area dividing unit for dividing the received first printing image data into areas for each ink color or for each ink color overlay pattern;
    A color conversion unit that performs color conversion by arranging corresponding color blocks for each divided area; and
    An image processing apparatus comprising: an image data output unit that generates binary image data for each ink color from color-converted image data and outputs the generated data as second print image data.
  3. 請求項１又は２に記載の画像処理装置において、
    第一の印刷用画像データは特色の網点を含んでいることを特徴とする画像処理装置。     The image processing apparatus according to claim 1 or 2,
    An image processing apparatus, wherein the first print image data includes a halftone dot of a special color.
  4. 請求項１乃至３のいずれか一項に記載の画像処理装置において、
    前記インク色の混合比は、第一、第二の印刷装置のインク色の印刷順序と透過度とに基づいて設定することを特徴とする画像処理装置。     In the image processing device according to any one of claims 1 to 3,
    The ink color mixing ratio is set based on a printing order and transparency of ink colors of the first and second printing apparatuses.
  5. 請求項１乃至４のいずれか一項に記載の画像処理装置において、
    受け入れた第一の印刷用画像データの網点の一部を、所定基準に従って拡大又は縮小するドットゲイン調整処理を行うことを特徴とする画像処理装置。     In the image processing device according to any one of claims 1 to 4,
    An image processing apparatus for performing dot gain adjustment processing for enlarging or reducing a part of a halftone dot of received first printing image data according to a predetermined standard.
  6. 第一の印刷装置に対応した第一の印刷用画像データから、第二の印刷装置に対応した第二の印刷用画像データを生成する画像処理をコンピュータに実行させるためのコンピュータ用プログラムにおいて、
    第一の印刷装置のインク色毎又はインク色の重ね合わせパターン毎に、第二の印刷装置のインク色の混合比を設定する工程と、
    第一の印刷用値画像データを受け入れる工程と、
    受け入れた第一の印刷用画像データを、前記インク色毎又はインク色の重ね合わせパターン毎の領域に区分する工程と、
    区分された領域毎に、対応したインク色の混合比に従った混合色を割り当てて色変換する工程と、
    色変換された画像データからインク色毎の多階調画像データを生成する工程と、
    生成されたインク色毎の多階調画像データを、第二の印刷用画像データとして出力する工程とを備えることを特徴とするコンピュータ用プログラム。     In a computer program for causing a computer to execute image processing for generating second printing image data corresponding to a second printing device from first printing image data corresponding to the first printing device,
    A step of setting a mixing ratio of ink colors of the second printing device for each ink color of the first printing device or each overlapping pattern of ink colors;
    Accepting first print value image data;
    Dividing the received first printing image data into regions for each ink color or for each ink color overlay pattern;
    Assigning a mixed color according to the mixing ratio of the corresponding ink color for each divided area, and performing color conversion;
    Generating multi-tone image data for each ink color from the color-converted image data;
    And a step of outputting the generated multi-tone image data for each ink color as second print image data.
  7. 第一の印刷装置に対応した第一の印刷用画像データから、第二の印刷装置に対応した第二の印刷用画像データを生成する画像処理をコンピュータに実行させるためのコンピュータ用プログラムにおいて、
    第一の印刷装置のインク色毎又はインク色の重ね合わせパターン毎に、第二の印刷装置のインク色の混合比を設定する工程と、
    設定された各インク色の混合比に従って、所定数の画素を配列させたブロックの各画素に第二の印刷装置のインク色のいずれかを割り当てることで、複数種別の色ブロックを生成する工程と、
    第一の印刷用画像データを受け入れる工程と、
    受け入れた第一の印刷用画像データを、前記インク色毎又はインク色の重ね合わせパターン毎の領域に区分する工程と、
    区分された領域毎に、対応した色ブロックを配列させることで色変換する工程と、
    色変換された画像データからインク色毎の二値画像データを生成する工程と、
    生成されたインク色毎の二値画像データを、第二の印刷用画像データとして出力する工程とを備えることを特徴とするコンピュータ用プログラム。     In a computer program for causing a computer to execute image processing for generating second printing image data corresponding to a second printing device from first printing image data corresponding to the first printing device,
    A step of setting a mixing ratio of ink colors of the second printing device for each ink color of the first printing device or each overlapping pattern of ink colors;
    A step of generating a plurality of types of color blocks by assigning one of the ink colors of the second printing apparatus to each pixel of the block in which a predetermined number of pixels are arranged in accordance with the set mixing ratio of each ink color; ,
    Receiving the first print image data;
    Dividing the received first printing image data into regions for each ink color or for each ink color overlay pattern;
    A step of performing color conversion by arranging corresponding color blocks for each divided area; and
    Generating binary image data for each ink color from the color-converted image data;
    And a step of outputting the generated binary image data for each ink color as second print image data.
  8. 請求項６又は７に記載のコンピュータ用プログラムにおいて、
    第一の印刷用画像データは特色の網点を含んでいることを特徴とするコンピュータ用プログラム。     The computer program according to claim 6 or 7,
    A computer program characterized in that the first print image data includes a halftone dot.
  9. 請求項６乃至８のいずれか一項に記載のコンピュータ用プログラムにおいて、
    前記インク色の混合比は、第一、第二の印刷装置のインク色の印刷順序と透過度とに基づいて設定することを特徴とするコンピュータ用プログラム。     The computer program according to any one of claims 6 to 8,
    The computer program according to claim 1, wherein the mixing ratio of the ink colors is set based on a printing order and transparency of the ink colors of the first and second printing apparatuses.
  10. 請求項６乃至９のいずれか一項に記載のコンピュータ用プログラムにおいて、
    受け入れた第一の印刷用画像データの網点の一部を、所定基準に従って拡大又は縮小するドットゲイン調整処理を行うことを特徴とするコンピュータ用プログラム。     The computer program according to any one of claims 6 to 9,
    A computer program for performing dot gain adjustment processing for enlarging or reducing part of a halftone dot of received first printing image data according to a predetermined standard.
  11. 第一の印刷装置に対応した第一の印刷用画像データから、第二の印刷装置に対応した第二の印刷用画像データを生成する画像処理方法において、
    第一の印刷装置のインク色毎又はインク色の重ね合わせパターン毎に、第二の印刷装置のインク色の混合比を設定し、
    第一の印刷用画像データを受け入れ、
    受け入れた第一の印刷用画像データを、前記インク色毎又はインク色の重ね合わせパターン毎の領域に区分し、
    区分された領域毎に、対応したインク色の混合比に従った混合色を割り当てて色変換し、
    色変換された画像データからインク色毎の多階調画像データを生成し、第二の印刷機用画像データとして出力することを特徴とする画像処理方法。     In an image processing method for generating second printing image data corresponding to a second printing device from first printing image data corresponding to the first printing device,
    For each ink color of the first printing device or for each ink color overlay pattern, set the ink color mixing ratio of the second printing device,
    Accept first print image data,
    The received first printing image data is divided into regions for each ink color or for each ink color overlay pattern,
    For each divided area, assign a mixed color according to the mixing ratio of the corresponding ink color and perform color conversion.
    An image processing method comprising: generating multi-tone image data for each ink color from color-converted image data, and outputting the image data as second image data for a printing press.
  12. 第一の印刷装置に対応した第一の印刷用画像データから、第二の印刷装置に対応した第二の印刷用画像データを生成する画像処理方法において、
    第一の印刷装置のインク色毎又はインク色の重ね合わせパターン毎に、第二の印刷装置のインク色の混合比を設定し、
    設定された各インク色の混合比に従って、所定数の画素を配列させたブロックの各画素に第二の印刷装置のインク色のいずれかを割り当てることで、複数種別の色ブロックを生成し、
    第一の印刷用画像データを受け入れ、
    受け入れた第一の印刷用画像データを、前記インク色毎又はインク色の重ね合わせパターン毎の領域に区分し、
    区分された領域毎に、対応した色ブロックを配列させることで色変換し、
    色変換された画像データからインク色毎の二値画像データを生成し、第二の印刷機用画像データとして出力することを特徴とする画像処理方法。     In an image processing method for generating second printing image data corresponding to a second printing device from first printing image data corresponding to the first printing device,
    For each ink color of the first printing device or for each ink color overlay pattern, set the ink color mixing ratio of the second printing device,
    By assigning one of the ink colors of the second printing apparatus to each pixel of the block in which a predetermined number of pixels are arranged according to the set mixing ratio of each ink color, a plurality of types of color blocks are generated,
    Accept first print image data,
    The received first printing image data is divided into regions for each ink color or for each ink color overlay pattern,
    For each divided area, color conversion is performed by arranging corresponding color blocks,
    An image processing method comprising: generating binary image data for each ink color from color-converted image data and outputting the image data as image data for a second printing press.
  13. 請求項１１又は１２に記載の画像処理方法において、
    第一の印刷用画像データは特色の網点を含んでいることを特徴とする画像処理方法。     The image processing method according to claim 11 or 12,
    An image processing method, wherein the first print image data includes a halftone dot.
  14. 請求項１１乃至１３のいずれか一項に記載の画像処理方法において、
    前記インク色の混合比は、第一、第二の印刷装置のインク色の印刷順序と透過度とに基づいて設定することを特徴とする画像処理方法。     The image processing method according to any one of claims 11 to 13,
    The ink color mixing ratio is set based on the printing order and transparency of ink colors of the first and second printing apparatuses.
  15. 請求項１１乃至１４のいずれか一項に記載の画像処理方法において、
    受け入れた第一の印刷用画像データの網点の一部を、所定基準に従って拡大又は縮小するドットゲイン調整処理を行うことを特徴とする画像処理方法。
          The image processing method according to any one of claims 11 to 14,
    An image processing method comprising: performing dot gain adjustment processing for enlarging or reducing part of a halftone dot of received first printing image data according to a predetermined standard.
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