JP2007176015A - Dry-down compatible calibration system and dry-down compatible calibration method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dry-down compatible calibration system and a dry-down compatible calibration method for making a dried-down printed product and calibration paper capable of making visual colors coincide with one another. <P>SOLUTION: This dry-down compatible calibration system comprises: a dry-down correction function creating means which creates the dry-down correction function of converting colorimetric data into colorimetric data for dry-down, by using the colorimetric data on a color chart immediately after printing, a printed color chart dried down, and a calibration color chart; a colorimetric data creating means which converts platemaking data into the colorimetric data, with reference to a printing device profile; a means for creating the colorimetric data for dry-down, which converts the colorimetric data into the colorimetric data for dry-down by using the dry-down correction function; and a means for creating the platemaking data for dry-down, which creates the platemaking data for dry-down from the colorimetric data for dry-down by using the calibration device profile. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a proofreading system and a proofreading method for creating a proof paper for printed color that has been dried down in consideration of dry down of printed products.

Conventionally, in the plate-making process, the color information of the plate-making data of the dry-down type calibration device is corrected so that the color of the dry-down printed product matches the color of the proof paper, and dry-down printing is performed. Producing color proof paper.

For example, in Patent Document 1, a measurement value of dry-down printing is set as a reference value, and a colorimetric value of a printed matter before dry-down is used to perform an approximate calculation using a Neugebauer equation and compared with the reference value. Thus, a technique for determining whether or not a condition is satisfied is disclosed. (Prior art 1)
Japanese Patent No. 3661230 (pages 13-14, FIG. 16)

By the way, in the current digital plate-making process, color correction processing of plate-making data is performed using an ICC profile. However, in Patent Document 1, since it does not correspond to the ICC profile, it does not conform to a normal work mode. There was a drawback. Furthermore, a work procedure using special color correction processing data different from the ICC profile has to be used, and there is a problem that the work content becomes complicated.

Here, the ICC profile is electronic data created along the file structure proposed by the ICC (International Color Consortium). An ICC profile called a device profile includes a color material amount (a value defined by CMYK: hereinafter, a CMYK value or a value defined by RGB) depending on a device (for example, a printing apparatus or a dry-down proofing apparatus). ) And device-independent colorimetric values (CIE L ^* a ^* b ^* values: hereinafter L ^* A ^* B ^* values, or CIE XYZ values), from two tables, CMYK values A color conversion table to L ^* A ^* B ^* values and a color conversion table from L ^* A ^* B ^* values to CMYK values are provided.

The present invention has been made in consideration of such a conventional technique, and the problem of the present invention is that, in color proofing work, a proof paper by a digital dry-down proofing device, a dry-down printed product, To provide a digital dry-down proofing apparatus and method including a color correction process so that a visual color match can be obtained.

The present invention solves the above problems by the following means. In other words, the invention described in claim 1 is a dry-down proof calibration system configured by connecting a dry-down compliant tool creation device and a dry-down proof calibration device via a network, wherein the dry-down proof tool creation The device measures colorimetric data that measures the color chart immediately after printing, colorimetric data that measures the color chart of the dried-down color, colorimetric data that measures the calibration color chart, and standard colorimetric data of the color chart. A printing device profile in which color chart reference data, including halftone dot data for plate making, colorimetric data adapted to the color characteristics of the printing apparatus, and halftone dot data adapted to the color characteristics of the printing apparatus are associated, and plate making Device that matches the halftone dot data and colorimetric data adapted to the color characteristics with the halftone dot data adapted to the color characteristics of the calibration device Storage means for storing a profile, spectral measurement means for spectroscopically measuring a color chart to generate colorimetric data, color chart colorimetric data, and color chart reference data, and obtaining a device profile A device profile creation means for creating a dry-down correction function creation means for creating a dry-down correction function from color measurement data for a color chart immediately after printing and colorimetry data for a dry-down color chart; A tool creating apparatus comprising: a tool transmission unit configured to transmit the dry-down correction function generated and the printing device profile and the calibration device profile created by the device profile creation unit. The apparatus includes plate making data including halftone dot data and the printing device. Storage means for storing the profile, the calibration device profile, and the dry-down correction function, tool receiving means for receiving the transmitted dry-down correction function, printing device profile, and calibration device profile, and plate-making data. Receiving plate making data receiving means, obtaining plate making data, referring to the printing device profile, color measurement data creating means for converting the plate making data into color measurement data, and using a dry down correction function, A dry-down colorimetric data creating means for converting colorimetric data into dry-down colorimetric data, and a dry-down plate making data from the dry-down colorimetric data using the calibration device profile Plate making data creation means, print plate data and print proof paper A dry-down proofing system comprising a proof paper creating means.

Here, the printing device profile and the calibration device profile are ICC profiles. By using the two color conversion tables of the ICC profile, the CMYK value can be color-converted to the CMYK value adapted to the color characteristic of the device via the LAB value. At this time, in the present invention, processing is applied to the L ^* A ^* B ^* values that pass through. That is, the plate making data (CMYK value) is converted into colorimetric data (L ^* A ^* B ^* value) with reference to the color conversion table of the printing device profile. Next, this colorimetric data (L ^* A ^* B ^* value) is subjected to dry-down processing. Finally, color conversion of the color measurement data (L ^* A ^* B ^* values) processed by dry-down processing is performed with reference to the color conversion table of the calibration device profile to CMYK values adapted to the color characteristics of the calibration apparatus. Can do. Therefore, the dry-down proofreading apparatus can print the dry-down calibration paper having the same color as the dry-down printed material from the plate making data.

According to a second aspect of the present invention, a plate making data including halftone dot data, the printing device profile, the calibration device profile, and a storage unit for storing a dry-down correction function, and a plate making data are acquired and printed. By using a colorimetric data creating means for converting the plate making data into colorimetric data with reference to the device profile and a drydown correction function, the colorimetric data for drydown is converted into colorimetric data for drydown. Using color data creation means and calibration device profile, dry-down plate making data creation means for creating plate-making data for dry-down from the dry-down colorimetric data, plate-making data is obtained, and proof paper is obtained. A dry-down proofing device comprising a proof paper preparation means for printing.

According to a third aspect of the present invention, colorimetric data obtained by measuring the color chart immediately after printing, colorimetric data obtained by measuring the color chart of the dry-down, colorimetric data obtained by measuring the calibration color chart, and color The color chart reference data including the reference colorimetric data of the chart, the halftone dot data of the plate making, the colorimetric data adapted to the color characteristics of the printing apparatus, and the halftone dot data adapted to the color characteristics of the printing apparatus are associated. Storage means for storing a printing device profile, calibration device profile in which color measurement data adapted to color characteristics of plate making and halftone data adapted to color characteristics of a calibration apparatus are associated with each other; Spectral measurement means for spectroscopic measurement of a color chart to generate colorimetric data, color chart colorimetric data, and color chart reference data are acquired to obtain a device program. A device profile creation means for creating a file, and a dry-down correction function creation means for creating a dry-down correction function from the color measurement data of the color chart immediately after printing and the color measurement data of the dry-down color chart. This is a dry-down-compatible tool creation device.

According to a fourth aspect of the present invention, plate making data including halftone dot data, colorimetric data obtained by measuring a color chart, color chart reference data including reference colorimetric data of a color chart, halftone dot data, and colorimetry A dry-down calibration method using a device profile corresponding to data, a spectral measurement step of spectrally measuring a color chart to create colorimetric data, colorimetric data of the color chart, and color A dry-down correction function is created from the device profile creation step that obtains the chart reference data and creates a device profile, the color measurement data of the color chart immediately after printing, and the color measurement data of the dry-down color chart. Generating a dry-down correction function, obtaining plate-making data, and printing device profile A colorimetric data conversion step for converting the plate-making data into colorimetric data using a file, and dry-down colorimetric data for converting the colorimetric data into dry-down colorimetric data using a dry-down correction function. A conversion step, a plate-making data creation step for dry-down that creates plate-making data for dry-down from the colorimetric data for dry-down using the calibration device profile, and a plate-making data are acquired and printed on a proof paper A dry-down proofreading method, characterized in that the dry-down proofreading method is performed according to a procedure including:

According to a fifth aspect of the present invention, by incorporating the computer into the computer, the dry-down calibration system or the dry-down calibration system according to any one of the first to third aspects, or A computer program that operates as a tool for creating a dry-down tool

The invention described in claim 6 is a computer-readable recording medium in which the computer program according to claim 5 is recorded.

According to the present invention, a dry-down calibration paper can be easily and easily created using a dry-down proofing apparatus using an ICC profile.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.
FIG. 1 is an explanatory diagram of a rough configuration of a dry-down proofing system that calibrates a printed material to be dry-down according to the present invention.
The dry-down proofing system 1 includes a dry-down compliant tool creation device 100, a dry-down proofing device 300, a DTP device 500, and a printing device 700 connected by a network 900.

The dry-down-compatible tool creation apparatus 100 creates and transmits a printing device profile 197, a calibration device profile 195, and a dry-down correction function 199.
The dry-down proofing apparatus 300 holds the printing device profile 197, the dry-down correction function 199, and the calibration device profile 195, receives the plate-making data 599, and receives the printing proof paper 399a or the calibration for dry-down. Paper 399b is created.

The DTP device 500 creates the plate making data 599 and transmits it.
The printing apparatus 700 holds the printing device profile 791, receives the plate making data 599, and creates a printed matter 799.
The print proof paper 399a and the printed material 799 immediately after printing have the same color.
The dry-down calibration paper 399b and the dry-down printed matter 799 have the same color.

FIG. 2 is a diagram for explaining a rough processing flow of the dry-down color correction system. The printing machine 700 prints the printing color chart 799 without referring to the printing device profile (FIG. 2A). The dry-down-compatible tool creation apparatus 100 performs colorimetry on the print color chart 799 immediately after printing, creates colorimetric data 193, and creates a print device profile 197. (Fig. 2 (a)).

The proofing machine 300 prints the proof color chart 399 without referring to the proof device profile 195 (same (f)). The dry-down-compatible tool creation apparatus 100 measures the calibration color chart 399, creates the color measurement data 193, and creates the calibration device profile 195 (same (G)).

The dry-down-compatible tool creation apparatus 100 creates a dry-down correction function 199 using the color measurement data of the print color chart 799 immediately after printing and the color measurement data of the print color chart that has been dry-down (same as above). The created print profile 197, proof device profile 195, and dry down correction function 199 are transmitted to the dry down compatible proof device 300 (same as above). The dry-down proofing apparatus 300 receives the printing profile 197, the proofing device profile 195, and the dry-down correction function 199 and registers them (same (na)).

The dry-down proofreading apparatus 300 receives the plate-making data 599 and prints the printing proof paper 399a that has the same color as the printed material immediately after printing. Further, the dry-down proofing apparatus 300 uses the printing profile 197, the proofing device profile 195, the dry-down correction function 199, and the received plate-making data 599, to prepare the dry-down proof paper 399b having the same color as the dry-down printed matter. Create (same as (c)).

Note that the print proof paper 399a is used, for example, for proofreading a printed material immediately after the printing apparatus 700. The dry-down proof paper 399b is used, for example, for proofreading the printed matter that has been delivered and dried down.

FIG. 3 is a detailed configuration diagram of the dry-down calibration system according to the present invention. The dry-down compatible calibration system 1 is configured by connecting a dry-down compatible tool creation apparatus 100 and a dry-down compatible calibration apparatus 300 via a network. The dry-down-compatible tool creation apparatus 100 includes a spectroscopic measurement unit 130, a device profile creation unit 110, a dry-down correction function creation unit 120, a tool transmission unit 170, and a storage unit 190. The storage unit 190 stores plate making data 599, color measurement data 193, color chart reference data 191, calibration device profile 195, printing device profile 197, and dry-down correction function 199.

The plate making data 599 is halftone data of YMCK values. The color measurement data 193 is an L ^* A ^* B ^* value obtained by measuring the color chart. The color chart reference data is reference color measurement data (reference L ^* A ^* B ^* values) of the color chart. The calibration device profile 195 includes halftone dot data (YMCK value) of plate making data, colorimetric data (L ^* A ^* B ^* value) of a drydown compatible calibration apparatus, and halftone data (YMCK value) of a drydown compatible calibration apparatus. ). The printing device profile 197 is data in which halftone dot data (YMCK value) of plate making data is associated with colorimetric data (L ^* A ^* B ^* value) of the printing apparatus. The dry down correction function 199 is a mathematical formula.

The spectroscopic measurement stage 130 spectroscopically measures the color chart 799 to create colorimetric data 193.

The device profile creation means 110 acquires the color chart colorimetric data 193 and the color chart reference data 191 and creates a device profile. Specifically, the device profile creation unit 110 obtains the color measurement data 193 and color chart reference data created from the color chart immediately after printing by the printing apparatus, and creates the printing device profile 197. Similarly, the device profile creation unit 110 obtains the color measurement data 193 and the color chart reference data created from the color chart printed by the dry-down type calibration apparatus, and creates the calibration device profile 195.

The dry-down correction function creating unit 120 uses the color measurement data 193 of the color chart immediately after printing and the color measurement data 193 of the color chart that has been dried down, to perform color measurement that is dry-down from the color measurement data 193 before dry-down. A dry-down correction function 199 for calculating the data 193 is created. The tool transmission unit 170 transmits the created printing device profile 197, calibration device profile 195, and dry-down correction function 199.

The spectroscopic measurement unit 130, the device profile creation unit 110, the dry-down correction function creation unit 120, and the tool transmission unit 170 are computer programs. The plate making data 599, the colorimetric data 193, the color chart reference data, the calibration device profile 195, the printing device profile 197, and the dry-down correction function 199 are computer-readable data. The storage unit 190 is a memory.

The dry-down calibrating apparatus 300 includes a tool receiving unit 310, a colorimetric data creating unit 322, a dry-down colorimetric data creating unit 324, a plate-making data creating unit 326 for dry down, a storage unit 390, Is provided. The storage unit 390 stores plate making data 599, colorimetric data 193, and a dry down correction function 199.

The tool receiving unit 310 receives the printing device profile 197, the proofing device profile 195, and the dry down correction function 199.

The colorimetric data creation unit 322 acquires platemaking data, refers to a printing device profile, selects a LAB value corresponding to the YMCK value of the platemaking data, and creates colorimetric data 193 including the LAB value. To do. The dry-down color measurement data creating means 324 converts the color measurement data 193 into dry-down color measurement data 193 using a dry-down correction function 199.
The dry-down plate-making data creating means 326 creates dry-down plate-making data from the dry-down colorimetric data 193 using a calibration device profile.

In this way, by combining the colorimetric data creation means 322, the color measurement data creation means 324 for dry-down, and the plate-making data creation means 326 for dry-down, dry-down can be performed from the plate-making data 599 before dry-down. Plate-making data 599 for dry-down for coloring is created.

The proof paper creation unit 330 acquires the plate making data 599 and prints the proof paper for printing. Further, the proof paper preparation unit 330 acquires the plate-making data 599 for dry-down, and prints the dry-down proof paper 399b.

Tool receiving means 310, colorimetric data creating means 322, dry-down colorimetric data creating means 324, and dry-down plate-making data creating means 326 are computer programs. The storage unit 190 is a memory.

FIG. 4 is a diagram for explaining the processing outline of the dry-down capable tool creation apparatus 100 according to the present invention. The printing apparatus 700 prints the print color chart 799 using the color chart data 599 (FIG. 4 (1)). The dry-down compliant calibration apparatus prints the calibration color chart 399 using the color chart data 599 ((2)).

The dry-down-compatible tool creation apparatus 100 uses a spectroscope 130 for a print color chart 799 immediately after printing and a print color chart 799 and a calibration color chart 399 that have been dried down after a sufficient amount of time (for example, after 17 hours). Then, color measurement is performed to create color measurement data 193 ((3)).

The dry-down-compatible tool creation apparatus 100 creates a printing device profile 197 from the color measurement data 193 of the printing color chart 799 immediately after printing. The dry-down compatible tool creation apparatus 100 creates a calibration device profile 195 from the colorimetric data 193 of the calibration color chart 399. The dry-down-compatible tool creation apparatus 100 creates a dry-down correction function 199 from the colorimetric data 193 of the print color chart 799 immediately after printing and the print-down color chart 799 that has been dried down ((4)).

5 and 6 are examples of measurement data of the print color chart. FIG. 5 shows the color measurement data 193 of the print color chart immediately after printing. FIG. 6 shows colorimetric data 193 of a printed color chart that has been dried down 17 hours after printing. For example, the values of “C” in the colorimetric data 193 of the color chart 193 immediately after printing in FIG. 5 are “L ^* = 52.92”, “a ^* = − 36.04”, “b ^* = − 51.59”. The value of “C” in the colorimetric data 193 of the printed color chart after 17 hours of 6 is “L ^* = 53.38”, “a ^* = − 36.31”, “b ^* = − 51.01” Illustrated.

FIG. 7 is an example of the dry-down correction function. The dry-down correction function is a quadratic function that calculates a colorimetric value “L ^* ′ a ^* ′ b ^* ′ value” of a dry-down printed material from a colorimetric value “L ^* a ^* b ^* value” of the printed material immediately after printing. It is. In FIG. 7, the dry-down correction function f (L ^* ′) for calculating the complementary value L ^* ′ is expressed as “f (L ^* ′) = − 0.3589 + 1.276087 × L ^* + 0.056779 × a ^* −0.05104 × b ^{*. -0.0025 × (L *) 2 -} 0.00117 × (a *) 2 - 0.00167 × (b *) 2 - 0.00124 × L * × a * + 0.001696 × L * × b * + 0.000459 × a * × b * "in Some are illustrated (FIG. 7 (1)). Further, the dry-down correction function f (a ^* ′) for calculating the complementary value a * ′ is “f (a ^* ′) = − 0.18963−0.00358 × L ^* + 0.977034 × a ^* + 0.008911 × b ^* −0.00013 × (L ^* ) ² + 0.000144 × (a ^* ) ² + 0.000252 × (b ^* ) ² + 0.000298 × L ^* × a ^* -0.00016 × L ^* × b ^* -0.00033 × a ^* × b ^* It is exemplified ((2)). Further, the dry-down correction function f (b ^* ′) for calculating the complementary value b ^* ′ is “f (b ^* ′) = 2.200389−0.25309 × L ^* + 0.012552 × a ^* + 1.051908 × b ^* + 0.002153 × ( ^{L *) 2 + 0.000942 × (} a *) 2 + 0.001261 × (b *) 2 - 0.00027 × L * × a * - 0.00163 × L * × b * - 0.00036 × a * × b * "is a thing illustrative (3).

This dry-down correction function was calculated by second order regression analysis in consideration of non-linear effects. (Details of the calculation procedure will be described later.) Also, the interpolation accuracy is a dry-down correction function calculated from the quadratic regression analysis formula, and there is no problem in practical use. A dry-down correction function may be calculated from the multiple regression analysis formula and used.

FIG. 12 is an explanatory diagram of a procedure for calculating a dry-down correction function by multiple regression analysis (second order).
The general formula of the quadratic regression analysis model is “Y _i = α _0i + α _1i × L ^* _i + α _2i × a ^* _i + α _3i × b ^* _i + α _4i × (L ^* _i ) ² + α _5i (a ^* _i ) ² + α _6i × (b ^* _i ) ² + α _7i × L ^* _i × a ^* _i + α _8i × L ^* _i × b ^* _i + α _9i × a ^* _i × b ^* _i (FIG. 12 (1)).

Here, “Y _i ” is “the value of L ^* ′, or the value of a ^* ′, or the value of b ^* ′” of each color of the dry-down printed color chart. “Α _i ” is “a complementary coefficient when the value is L ^* , a complementary coefficient when the value is a ^* , or a complementary coefficient when the value is b ^* ”. “L ^* _i ” is “the value of L ^* for each color of the print color chart”. “A ^* _i ” is “a ^* value of each color of the print color chart”. “B ^* _i ” is “value of b ^* of each color of the print color chart”.

The color measurement values of the “C” color of the print color chart are “L ^* _i = 52.92”, “a ^* _i = −36.04”, “b ^* _i = −51.59”, respectively, The color measurement value of the “C” color of the chart is “L ^* ′ = 53.38”. At this time, “(L ^* _i ) ² = 2800.526”, “(a ^* _i ) ² = 1298.882”, “(b ^* _i ) ² = 2661.528”, “L ^* _i × a ^* _i = −1907.24”, “ L ^* _i * b ^* _i = -2730.14 "and" a ^* _i * b ^* _i = 1859.304 "((2)).

For example, if the value of the above-mentioned print color chart “C” color is substituted into the general expression of the second order regression analysis model, “(53.38) = α _0i + α _1i × (52.92) + α _2i × (−36.04 ) + Α _3i × (-51.59) + α _4i × (2800.526) + α _5i × (1298.882) + α _6i × (2661.528) + α _7i × (-1907.24) + α _8i × (-2730.14) + α _9i × (1859.304) ”((3)).

In this way, the colorimetric values of all the colors in the printed color chart are substituted into the general expression of the quadratic multiple regression analysis model, and the square expression G of the difference between the left side and the right side is created. Ten differential equations are obtained by partial differentiation with the complementary coefficients “α _0i , α _1i ,..., Α _9i ” ((4)).

Here, the general formula of the square formula G of the difference between the left side and the right side is as follows. “G = total {Y _i − (α _0i + α _1i × L ^* _i +... + Α _9i × a ^* _i × b ^* _i )} ² ”. Further, for example, a linear equation obtained by partial differentiation of the square equation G with a complementary coefficient α _0i is expressed as “ΦG / Φ α _0i = −2 × summation {Y _i − (α _0i + α _1i × L ^* _i +. α _9i × a ^* _i × b ^* _i )} ”.

The calculated complement coefficients are "α _0i = -0.3589", "α _1i = 1.276087", "α _2i = 0.056779", "α _3i = -0.05104", "α _4i = -0.0025", "α _5i = -0.00117 , “Α _6i = −0.00167”, “α _7i = −0.00124”, “α _8i = 0.001696”, and “α _9i = 0.000459” ((5)).

FIG. 8 is an explanatory diagram of the flow of the dry-down calibration paper creation process of the dry-down proofreading apparatus 300. The dry-down proofreading apparatus 300 converts the CMYK value of the plate-making data into the L ^* a ^* b ^* value using the printing device profile (FIG. 8 (1)). Using dry-down correction function, converting the colorimetric data (L ^* a ^* b ^* values) to colorimetric data for dry-down ^{(L * 'a *' b} * ' value) (same (2)). With reference to the calibration device profile, the color measurement data for dry-down (L ^* 'a ^* ' b ^* 'value) is converted into plate-making data for dry-down (CMYK value) that matches the color development characteristics of the calibration device. 3)). Proofreading paper is created using the plate-making data for dry down (CMYK value) that matches the color development characteristics of the proofing device ((4)).

The printing device profile 791 is a file associated with printing press designation information (for example, a printing press name), and has halftone dot information (for example, a combination of Y, M, C, and K halftone dot area ratios). Tabular device profile data in which color measurement information (for example, L ^* A ^* B ^* values) is associated with each other is recorded. Y is yellow, M is red, C is indigo, and K is black (black).

FIG. 9 is an explanatory diagram of the target color chart 799. The target color chart 799 is composed of target color patches 799b associated with the target color patch number 799a. The target color patch 799b is obtained by printing target color patch data in which basic colors having a halftone dot of 100% are combined. Therefore, for example, when the basic colors are Y, M, C, and K, the target color patch 799b has four target color patches composed of a single color and a target color patch composed of two colors. Are six colors, four target color patches composed of three colors, one target color patch composed of four colors, and one color of colorless (paper color) are 16 colors.

By the way, the combination of these 16 basic colors is “Y100% + M0% + C0% + K0%”, “M100% + Y0% + C0% + K0%”, “C100% + Y0% + M0% + K0%” “K100% + Y0% + M0% + C0%”, the combination of two colors is “Y100% + M100% + C0% + K0%”, “Y100% + C100% + M0% + K0%”, “Y100% + K100% + M0%” + C0% ”,“ M100% + C100% + Y0% + K0% ”,“ M100% + K100% + Y0% + C0% ”,“ C100% + K100% + Y0% + M0% ”, and the combination of the three colors is“ Y100% + M100% + C100% + K0% ”,“ Y100% + M100% + K100% + C0% ”,“ Y100% + C100% + K100% + M0% ”,“ M100% + C100% + K100% + Y0% ” Is “Y100% + M100% + C100% + K100%”, and the colorless combination is “Y0% + M0% + C0% + K0%”.

However, for example, “Y100%” represents a basic color Y having a halftone dot of 100%. “Y0%” indicates that the basic color Y does not exist.

FIG. 10 is a structural diagram of the CMYK value-L ^* A ^* B ^* value conversion table of the printing device profile 791. The CMYK value-L ^* A ^* B ^* value conversion table 197a converts halftone dot information (CMYK value) of plate making data into colorimetric value information (L ^* A ^* B ^* value) independent of the device. The CMYK value-L ^* A ^* B ^* value conversion table 197a is tabular data in which “data identification”, “halftone information”, and “colorimetric information” are associated with each other. “Data identification” is a unique number for identifying each data in the CMYK value-L ^* A ^* B ^* value conversion table 197a, and “halftone information” is a YMCK value (halftone area value) of the plate making data. Yes, “colorimetric information” is a colorimetric value (L ^* A ^* B ^* value) independent of the device.

For example, printing device profile data with “data identification = 841” has “halftone information” with “C = 1.0000, M = 1.0000, Y = 0.0000, K = 0.0000”, and “colorimetric information” has “ L ^* value = 22.6670037, a ^* value = 19.625000, b ^* value = −48.503906 ”.

FIG. 11 is a structural diagram of the L ^* A ^* B ^* value-CMYK value conversion table 195b of the calibration device profile 195. The L ^* A ^* B value-CMYK value conversion table 195b includes halftone dot information (CMYK values) in which colorimetric values (L ^* A ^* B ^* values) that do not depend on a device are matched with the color development characteristics of the dry-down-compatible calibration apparatus 300. ). The L ^* A ^* B ^* value-CMYK value conversion table 195b is tabular data in which “data identification”, “colorimetric information”, and “halftone information” are associated with each other.
The definition of each item is the same as the definition of each item in the CMYK value-L ^* A ^* B ^* value conversion table 197a.

For example, printing device profile data with “data identification = 2708” has “color measurement information” with “L ^* value = 49.476103, a ^* value = −72.085938, b ^* value = 28.070312”. “C = 0.9218, M = 0.0000, Y = 0.9467, K = 0.0000”.

As described above in detail, according to the present invention, it is possible to easily and easily create a dry-down calibration paper using a dry-down proofing apparatus using an ICC profile.

Overview of dry-down proofing system for proofreading printed materials Rough processing flow of dry-down calibration system Detailed configuration diagram of dry-down compatible tool creation device according to the present invention Outline of Drydown-Compatible Tool Creation Device 100 Colorimetric data of the print color chart immediately after printing Colorimetric data of the printed color chart after 17 hours from printing Illustration of drydown correction function Flow of processing for creating a proof paper for dry-down using a dry-down calibration system Example of target color chart CMYK value-L ^* A ^* B ^* value conversion table structure diagram of printing device profile 791 L ^* A ^* B ^* value-CMYK value conversion table structure diagram of calibration device profile 195 Explanatory diagram of calculation procedure of drydown correction function by multiple regression analysis

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dry down correspondence type calibration system 100 Dry down correspondence tool creation apparatus 130 Spectroscopic measurement means 110 Device profile creation means 120 Dry down correction function creation means 170 Tool transmission means 190 Storage means 193 Colorimetric data 195 Calibration device profile 197 Printing device profile 197a CMYK value-L ^* A ^* B ^* value conversion table 195b L ^* A ^* B ^* value-CMYK value conversion table 199 Drydown correction function 300 Drydown-compatible calibration device 310 Tool receiving means 322 Colorimetric data creation means 324 Drydown Color measurement data creation means 326 Dry-making plate making data creation means 390 Storage means 399a Printing calibration paper 399b Dry-down calibration paper 500 DTP device 599 Plate making data 700 Printing device 791 Device profile 799 prints, print the color chart 799a target color color patch number 799b target color color patches 900 Network

Claims (6)

A dry-down calibration system comprising a dry-down-compatible tool creation device and a dry-down calibration device connected via a network.
The dry-down compatible tool creation device is:
Colorimetric data obtained by measuring the color chart immediately after printing,
Colorimetric data obtained by measuring the color chart of the dry down,
Colorimetric data obtained by measuring the calibration color chart,
Color chart reference data including color chart reference colorimetric data;
A printing device profile that associates halftone dot data for plate making with color measurement data adapted to the color characteristics of the printing apparatus and halftone dot data adapted to the color characteristics of the printing apparatus;
A calibration device profile that associates halftone dot data of plate-making and color measurement data adapted to color characteristics and halftone dot data adapted to color characteristics of a calibration apparatus;
Storage means for storing
Spectroscopic measurement means for spectroscopically measuring a color chart and creating colorimetric data;
Device profile creation means for obtaining color measurement color measurement data and color chart reference data and creating a device profile;
A dry down correction function creating means for creating a dry down correction function from the color measurement data of the color chart immediately after printing and the color measurement data of the dry down color chart,
Tool transmission means for transmitting the created dry-down correction function, the printing device profile and the calibration device profile created by the device profile creation means,
A tool creation device comprising:
The dry-down calibration apparatus is
Plate making data including halftone dot data;
The printing device profile and the proofing device profile;
The dry-down correction function;
Storage means for storing
Tool receiving means for receiving the transmitted drydown correction function, printing device profile, and proofing device profile;
Plate making data receiving means for receiving plate making data;
Colorimetric data creating means for acquiring platemaking data, referring to the printing device profile, and converting the platemaking data into colorimetric data;
Using a dry down correction function, the color measurement data creating means for dry down for converting the color measurement data into the color measurement data for dry down,
Using the calibration device profile, plate-making data creation means for dry-down for creating plate-making data for dry-down from the color measurement data for dry-down,
Proofreading paper creation means to acquire platemaking data and print proofreading paper,
Is a dry-down calibration device equipped with
This is a dry-down calibration system. Plate making data including halftone dot data;
The printing device profile and the proofing device profile;
A drydown correction function,
Storage means for storing
Colorimetric data creating means for acquiring platemaking data, referring to the printing device profile, and converting the platemaking data into colorimetric data;
Using a dry down correction function, the color measurement data creating means for dry down for converting the color measurement data into the color measurement data for dry down,
Using a calibration device profile, a plate-making data creation means for dry-down that creates plate-making data for dry-down from the color measurement data for dry-down,
Proofreading paper creation means to acquire platemaking data and print proofreading paper,
A dry-down type calibration apparatus characterized by comprising: Colorimetric data obtained by measuring the color chart immediately after printing,
Colorimetric data obtained by measuring the color chart of the dry down,
Colorimetric data obtained by measuring the calibration color chart,
Color chart reference data including color chart reference colorimetric data;
A printing device profile that associates halftone dot data for plate making with color measurement data adapted to the color characteristics of the printing apparatus and halftone dot data adapted to the color characteristics of the printing apparatus;
A calibration device profile that associates halftone dot data of plate-making and color measurement data adapted to color characteristics and halftone dot data adapted to color characteristics of a calibration apparatus;
Storage means for storing
Spectroscopic measurement means for spectroscopically measuring a color chart and creating colorimetric data;
Device profile creation means for obtaining color measurement color measurement data and color chart reference data and creating a device profile;
A dry down correction function creating means for creating a dry down correction function from the color measurement data of the color chart immediately after printing and the color measurement data of the dry down color chart,
A dry-down-compatible tool creation apparatus characterized by comprising: Plate making data including halftone dot data;
Colorimetric data obtained by measuring the color chart,
Color chart reference data including color chart reference colorimetric data;
A device profile corresponding to halftone dot data and colorimetric data;
A dry-down calibration method using
A spectroscopic measurement step of spectroscopically measuring a color chart to create colorimetric data;
A device profile creation step for obtaining color measurement color measurement data and color chart reference data and creating a device profile;
A dry down correction function creation step for creating a dry down correction function from the color measurement data of the color chart immediately after printing and the color measurement data of the color chart dried down,
A colorimetric data conversion step of acquiring platemaking data and converting the platemaking data into colorimetric data using the printing device profile;
A color measurement data conversion step for dry down for converting the color measurement data into color measurement data for dry down using a dry down correction function;
Using the calibration device profile, a plate-making data creation step for dry-down for creating plate-making data for dry-down from the color measurement data for dry-down,
A step of creating a proof paper for dry-down to acquire plate making data and print a proof paper,
A dry-down calibration method, characterized in that it is performed by a procedure including The computer is operated as a dry-down compatible calibration system, a dry-down compatible calibration apparatus, or a dry-down compatible tool creation apparatus according to any one of claims 1 to 3 by being incorporated in a computer. Computer program to let you. A computer-readable recording medium on which the computer program according to claim 5 is recorded.

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