JPH0690495B2 - Film original plate making device for plain net - Google Patents

Description

TECHNICAL FIELD The present invention relates to a device for producing a film original plate of a region where a color is constant in a printed matter, that is, a so-called solid mesh portion.

(Prior Art) A large number of plain net parts are present in a color printed matter, but the plate making process of this plain net part is carried out in a special process different from the general color part, so-called tone making plate making process.
The conventional process will be described below with reference to the drawings.

FIG. 8 shows an example of a printed matter composed of a plain mesh portion. In the figure, a printed matter 50 is composed of a person 51, a mark 52 and a character portion 53, and has areas A1, A2, areas B1 to B6, area C1, areas D1 to D3, area E1, and a contour line S and a character W.
Have a constant color. The plate making of such a printed matter 50 is performed as follows.

First, a block copy 60 as shown in FIG. 9 is created. This is a drawing of only the contour line appearing in the printed matter 50 shown in FIG. Based on this artwork 60, a color instruction sheet 61 as shown in FIG. 10 is created. A contour line corresponding to the contour line drawn on the block copy 60 is roughly drawn in the color instruction sheet 61, and the areas A to E surrounded by the rough contour are given the color instruction as shown in the figure. At the same time, they are painted in colors close to those designated by colored pencils. Here, Y10 and M5 in area A
0 and C20 are the halftone dot area ratio (hereinafter referred to as "halftone%") of the yellow plate when making a disassembled plate, and the halftone dot% of the magenta plate.
50%, cyan plate net% 20%, black plate net% 0
It shows that it becomes%.

Next, a camera image of the block 60 shown in FIG. 9 is taken, and a positive 71 and a negative 72 as shown in FIGS. 11 (a) and 11 (b) are created. The positive 71 is used to create masks corresponding to the areas A to E shown in the color instruction sheet 61. The mask is a laminate of a colorless transparent base film and a light-shielding film, and the light-shielding film can be easily peeled off from the base film, and only the portion where the light-shielding film is peeled off transmits light. Therefore, a desired mask can be created by cutting the light-shielding film along the outline of the positive film 71 and the positive film 71 and then peeling the light-shielding film.

FIGS. 12 (a), (b), (c), (d), and (e) show the prepared mask, and the area without diagonal lines is the portion where the light-shielding film is peeled off. In the figure masks 81-85
Correspond to the areas A to E, respectively. That is, the mask 81 hides areas other than the areas A1 and A2 of the printed matter 50 shown in FIG. 6, the mask 82 hides areas other than the areas B1 to B6 of the printed matter 50, and the mask 83 hides areas other than the area C1 of the printed matter 50. The mask 84 hides the areas other than the areas D1 to D3 of the printed matter 50, and the mask 85 covers the printed matter 50.
Areas other than area E1 are hidden.

Next, a transparent film having halftone dots uniformly provided at a predetermined halftone percentage (hereinafter referred to as "flat halftone") and the above masks 81 to 85.
A film original plate for each color is prepared by using and, and this is performed by overlaying a mask and a flat screen, baking the film original plate, and forming halftone dots only on a desired portion of the film original plate.

FIG. 13 shows an outline of the process from the block 60 to the production of the printed matter 50. 91, 92, 93, 94, 95, 96 are plain nets, and the net% is 100% each. , 20%, 10%, 50%, 3
It is 0% and 8%. Incidentally, these various flat screens are prepared in advance. As shown in the drawing, the positive 71 and the negative 72 are created from the block 60, and the masks 81 to 85 are created from the positive 71, as described above.

Here, the method for creating the yellow plate 41 will be described.
Masks 81, 82, 83, 84 and flat screens 91, 92, 93 are used for this preparation. First, the mask 81 and the flat net 93 are overlapped and printed on the film original plate to form 10% halftone dots in the area A. Next, the mask 82 and the flat net 92 are stacked and baked, and the mask
83 and flat net 92 are stacked and baked, and finally mask 84 and flat net 91
Areas B and C of the same original film
Yellow plates 41 are prepared by forming halftone dots of 20%, 20%, and 100% on D, respectively. Similarly, from the masks 81, 82, 83 and the screens 94, 95, 93, the magenta plate 42 is changed to the masks 81, 82,
The cyan plate 43 is created from 83, 85 and the flat nets 92, 93, 96.

Also, since the black plate 44 is composed only of the contour lines drawn on the block 60 shown in FIG.
It is made from the negative 72 and the flat screen 91 shown in FIG. That is, the negative 72 and the flat net 91 are overlapped and baked on the film original plate to form 100% halftone dots at the contour line portion, and the black plate 44 is produced.

Yellow version 41 and Magenta version 4 created in this way
2 、 Cyan version 43 、 Black version 44 made a printing plate,
Overprinting is performed using ink and paper to create a printed matter 50.

(Problems to be Solved by the Invention) As described above, the conventional plate making process of the plain net portion is a complicated process using various masks and flat nets, and all the steps are manually performed. Not only does it take a long time to produce the film original plate, but also an error in the pattern position is apt to occur in the work of mask making and overprinting, which makes it difficult to obtain a desired printed matter. This problem was more remarkable as the design became more complicated.

The present invention has been made in view of the above-mentioned problems, and by directly creating a film original plate of each color using a computer, a mask is manually created and a flat screen is printed on the film original plate as in the prior art. It is an object of the present invention to provide a device which eliminates the steps and improves the efficiency of the plate making process of the plain net portion.

(Means for Solving the Problem) To achieve this object, the present invention relates to an image reading means for reading a line image drawn on a document, and a memory for storing the image data read by the image reading means in a rectangular form. Means, image display means for reading the image data stored in the storage means and displaying the line image, and coordinate designating means for designating the position of the area of the line image displayed on the image display means, A color instructing means for instructing the ratio of each color of yellow, magenta, cyan, and black to the area of the line image, and yellow, magenta, which is instructed by the color instructing means by combining the image data divided into squares,
A film for a plain network comprising arithmetic control means for producing film original data for each color based on the ratio of each color of cyan and black, and output means for outputting a film original for each color based on the film original data. Provide an original edition device.

(Operation) According to the present invention, the line image drawn on the document is input by the image reading means, and the line image is displayed on the image display means. Then, the position of the area of the line image displayed on the image display means is designated by the coordinate designating means, and yellow, magenta,
When the ratio of each color of cyan and black is designated by the color designating means, the film master data for each color is created by the arithmetic control means, and each color is output by the output means on the basis of the created film master data for each color. The original film of each film is output.

Further, the image data read by the image reading means is square-divided and stored in the storage means, the square-divided image is displayed on the image display means, and the correction processing for the line image is performed.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an example of the apparatus of the present invention. In the figure, a scanner 1 reads an image drawn on a document, and is connected to a computer 3 via an interface 2. The computer 1 mainly has a scanner 1
The external storage device 4 and the floppy disk device 7 for storing the image data taken in are connected. Reference numeral 6 denotes an output scanner for reading out the image data stored in the external storage device 4, processing it by the computer 3 and outputting it to the film original plate, which is connected to the computer 3 via the interface 5. 10 is a color separation device, a computer 11 and a display connected to the computer 11.
12. It is composed of a tablet 14 for inputting position data and a floppy disk device 15. The computer 3 and the computer 11 are connected by a communication line 18.

Next, the operation of the above device will be described. Here, the printed matter printed by the film original made by the above apparatus is the printed matter 50 shown in FIG.
It is assumed that the artwork 60 shown in the figure and the color instruction sheet shown in FIG. 10 are prepared.

First, the block copy 60 is set at a predetermined position of the scanner 1, the scanning head of the scanner 1 is scanned, and the image data of the contour line drawn on the block copy 60 is taken in. This image data is transferred to the computer via the interface 2. 3 memory. In this embodiment, the pixel density of the image data captured by the scanner 1 is 18 lines / mm, which is considerably coarser than the pixel density of the film original plate. This is to reduce the image data amount. The data stored in the memory of the computer 3 is read out, subjected to predetermined processing, and then stored in the external storage device 4 or the floppy disk set in the floppy disk device 7. The pixel density captured by the scanner 1 is not limited to the above example, and may be about 9 lines / mm for a printed matter that does not require image accuracy.

FIG. 2 is a flow chart showing processing of image data captured by the scanner 1. In the figure, when a start signal is given by operating a keyboard or the like connected to the computer 3, scanner input of image data is performed (S1) and the captured image data is binarized (S1).
2) Stored in computer memory. The stored image data is read out every several lines and dust removal processing is performed (S3). The dust removal process is a process of automatically removing an image having a size of several pixels or less as dust. Next, thinning processing of the image data is performed (S
4), the image density is reduced to 9 lines / mm. This is to facilitate later image processing and operator's operation.
If the pixel density of the image data captured by the scanner in step 1 is 9 lines / mm, the thinning process in step 4 is not necessary. Next, the image data is compressed (S4).
This data compression is performed by replacing one line of the binarized image data with address data at a point where white changes to black or black changes to white. After this, division processing of the image data is performed (S5). The image data is divided into several pieces by this division processing, but in this embodiment, as shown in FIG. 3, it is divided into four rectangles I1, I2, I3, and I4. This square division processing has a limit to the number of pixels that can be displayed on the display 12 of the color separation device 10 shown in FIG. 1, and it is not possible to display on the display 12 all the image data captured in S1 and thinned out in S4. It is done to. Next, the image data is compressed (S4). The data thus compressed is stored in the external storage device 4 or the floppy disk in the floppy disk device 7 (S7).

Next, the operation of the color separation device 10 will be described.
Since the computer 11 of FIG. 1 is designed to be able to take in image data from the floppy disk device 15 or the communication line 18, the case where data is taken in from the floppy disk device 15 will be described first.

FIG. 4 is a flowchart showing processing of image data in the color separation device 10.

First, the tablet 14 is operated to give a start signal, and the image data stored in the floppy disk set in the floppy disk device 15 is read (S10),
Display on display 12 (S11).

5 (a), (b), (c), and (d) are displays.
12 shows an image displayed on the screen 12. This image is displayed in a state of being divided into squares I1, I2, I3 and I4 shown in FIG. In the figure, T is a color scale, and X _a , X _b ,
X _c , X _d , Y _a , Y _b , Y _c , and Y _d are boundaries of the divided images, but these boundaries are not displayed on the display 12.

Here, in order to operate the color separation device 10, it is necessary to create the color scale T in advance, and a color table is used to create the color scale T. Therefore, the color table will be described first.

FIG. 6 shows a color table used in this embodiment. In the figure, Y represents yellow, M represents magenta, C represents cyan, and K represents black. The color table 30 takes out only the dot% of each color for each dot% of each color entered for each area of the pattern of the color instruction manual 61 shown in FIG. 10 and sequentially assigns the color numbers to those having different values. It is created by making a table. Then, the color number of the color table 30 and the dot% data of each color are input to the computer 11 from the keyboard connected to the tablet 14 or the computer 11 and stored in the floppy disk in the floppy disk device 15.

Next, the color scale T is created. Color scale T
16 from 512 colors that can be displayed on the display 12
The color can be selected and displayed. 16 colors are displayed by providing 4 image planes and representing each image data with 4 bits. The color is the color instruction sheet 61 shown in FIG.
A color close to the color displayed in is selected, and the color number of the color table 30 is attached to the selected color. Since such color selection is a known technique, detailed description thereof will be omitted.
In this embodiment, five kinds of colors are used as shown in FIG. 8, so that five kinds of color bands of t1, t2, t3, t4 and t5 are displayed on the color scale T. Further, since black, which is used as the color of the outline, is usually used for any pattern, it is always displayed in the color band t0 at the lower right corner of the color scale T. The color bands t1, t2, t3, t4, t5, and t0 are assigned color numbers 1, 2, 3, 4, 5, and 6, respectively.

In step 11 of FIG. 4, image display on the display 12 is first performed on the image I1 as shown in FIG. 5 (a). Next, it is judged whether or not to correct the displayed image data (S12).
Is selected (S13).

When the correction No. 1 is selected, the pattern correction process is performed (S1
Four). The pattern correction process is a process of supplementing the missing part or erasing the unnecessary line when the contour line of the image displayed on the display 12 is missing or there is an unnecessary line. This process is performed by first operating the tablet 14 to select a desired color band from the color scale T, using the tablet 14 to input position data of the missing part, and selecting the missing part from the selected color. It is done by supplementing with. In the present embodiment, since the contour lines are all black, the color band t0 of the color scale T may be selected. If you want to erase unnecessary lines, use the color scale T
From the above, a colorless color band (not shown) may be selected, and the same operation as that for capturing the above-mentioned missing portion may be performed.

Next, when the correction No. 2 is selected, the bank creating process is performed (S15). The embankment creation process is a process in which the outline of the image on the display 12 is originally missing, but when this missing part also becomes a color boundary, data for the missing part is newly created. Although not necessary for the image I1, specifically, the data of the broken line portion L is created for the image I3 shown in FIG. 5 (c). The data of the broken line portion L is created in the same manner as the above-mentioned pattern correction processing. That is, the tablet 14 is operated to select the color band from the color scale T. In this case, the color band of t5 is selected. Next, by inputting the position data of L using the tablet 14, the broken line portion L is created in the color of t5, and the data creation of this broken line portion L is completed.

Next, when correction No. 3 is selected, a hit rule processing is performed (S16). The hit rule processing is displayed as a contour line on the display 12, but since it is not a contour line but a simple color boundary, it is a process of converting this contour line into color boundary data. Although not necessary for the image I1, specifically, the one-dot chain line portion M having black data for the images I3 and I4 shown in FIGS. 5 (c) and (d) is converted to data of another color. To do. The conversion of the data of the one-dot chain line portion M is also performed by the same operations as the above-mentioned pattern correction processing and bank creation processing. That is, the tablet 14 is operated to select a color band from the color scale T. In this case, since the color of the one-dot chain line portion M is the same as that of the area C1, the color band t3 is selected from the color scale T. After this, tablet 14
Is operated to create the alternate long and short dash line portion M in the color of the color band t3, whereby the conversion of the data of the alternate long and short dash line portion M is completed.

When any one of the above-mentioned pattern correction process, bank creation process and hit ruled line process is performed, it is judged in step 17 whether or not the process is completed. If not completed, the process returns to step 13, and steps 14, 15 and Any one of 16 processes is performed.
In this way, the regions a1 and a of the image I1 shown in FIG.
When the boundary of 2, b1, b4, b5, b6, d1, d4, d5 is completed, that is, when the creation of the data indicating the color area is completed, the next color separation processing is performed (S18).

For color separation processing, operate the tablet 14 to set the color scale T
This is performed by selecting a desired color band from, and painting each area of the pattern with the color of the selected color band. Ie the image
Regarding the area a1 of I1, first, the tablet 14 is operated to specify the area a1, and further the tablet 14 is operated to specify the color band t1 of the color scale T.
Is filled with the color. Similarly, the region a2 has the color of the color band t1, the regions b1, b4, b5, b6 have the color of the color band t2, the regions d1, d4,
The color of the color band t4 is applied to d5. When the color separation processing for the image I1 is completed in this way, the color numbers given to the color bands painted in the respective areas are stored in the floppy disk in the floppy disk device 15 as color separation data ( S19).

Similarly, the processes from step 10 to step 19 are performed on the image I2, the image I3, and the image I4, and the regions a1 and a
2, b1, b2, b3, b4, b5, b6, c1, d1, d2, d3, d4, d
Color separation data for all 5 and e1 are stored in the floppy disk.

Here, in the color separation processing of step 18, the display 12
The operation of filling each area displayed in with a desired color is to operate the tablet 14 by applying the color band data of the boundary line of the image for which color separation processing has already been completed to the boundary line of the image displayed on the display 12. It can also be done automatically without doing. That is, for the image I2 shown in FIG. 5B, the color band data of the image on the boundary line Y _{a of the} image I1 shown in FIG. 5A is given to the pixels on the boundary line Y _b of the image I2. Thereby, the color band data of the color scale T is given to the areas a1, a2, b1, b5, b6, d1, and d4 of the image I2, and these areas are automatically painted with a desired color. Therefore, for the image I2, the color band data of the color scale T may be given by operating the tablet 14 only for the regions b2, b3, and d2.

Similarly, the color band data boundary X _a of the image I1 is given the boundary line X _c of the image I3, the boundary line X _d images I4, Y _d boundary X _b of the image I2 for the image I3 The color band data of the boundary line Y _c of the image is given, and a desired color is automatically painted on a part of the regions of the images I3 and I4. Then, the tablet 14 is operated with respect to the area which has not been colored yet, and the color separation processing ends.

The color separation process was performed by using the color scale T to paint each area of the pattern on the display 12 with a desired color. However, the color scale T was not used, and the image displayed on the display 12 was displayed. For each area, the tablet 14 may be operated to specify one area, and the color number of the color table 30 for the specified area may be directly input by operating the tablet 14 or the like.

The floppy disk in which the color-separation data is stored in this way is set in the floppy disk device 7 connected to the computer 3, and the data stored in the floppy disk in the computer 3 is converted into the data for the output scanner 6. To be done.

FIG. 7 is a flow chart showing the processing until the scanner 6 outputs the original film of each color based on the data stored in the floppy disk.

First, a start signal is given by operating a keyboard or the like connected to the computer 3 to read the data stored in the floppy disk from the floppy disk device 7 (S21). Then, the images I1, I2, I3, and I4 divided and stored in the floppy disk are combined. (S22) Interpolation processing is performed on the combined image data (S23). The interpolation process is a process of converting the pixel density of the image data into the pixel density for the film original plate, and in the present embodiment, the image data of 9 lines / mm is interpolated into 72 lines / mm of image data. The pixel density after interpolation is not limited to the above example and may be about 30 pixels / mm or more. Smoothing processing is performed on the interpolated image data (S24). The smoothing process removes the roughness of the contour line of the image generated by the interpolation process of step 23. The smoothing process smoothes the contour line of the image, and the pattern drawn on the block 60 shown in FIG. The state is close to the contour line of.

Next, the double processing is performed (S25). The dubbing process is a process for sloping the boundary between colors, and in the case of the printed matter 50 shown in FIG. 8, the above areas a1, a2, b1, b2, b3, b.
4, b5, b6, d1, d2, d3, d4, d5, e1 may be slightly covered so as to overlap the contour line.

After this, data conversion processing is performed (S21). The data conversion processing is the areas a1, a2, b1, b2, b3, b4, b5, b6, c1, d1, d which are input in the color separation processing of step 18 shown in FIG.
The color number data of 2, d3, d4, d5, and e1 is converted into halftone data of yellow, magenta, cyan, and black, and the color numbers of the color table 30 stored in the floppy disk and each color This is performed by reading out the halftone dot data and converting the color number data into Y, M, C and K halftone dot data. As a result, film original data for each color of yellow, magenta, cyan, and black are created.

Next, a case where the computer 11 shown in FIG. 1 fetches image data through the communication line 18 and performs color separation processing will be described. In this case, the data storage in step 7 of FIG. 2 is performed in the external storage device 4 shown in FIG.

First, in step 10 of FIG. 4, the computer 11 is a communication line.
The image data stored in the external storage device 4 is read out via 18. The processing from step 11 to step 18 is the same as when data is fetched from the floppy disk device 15. Then, the color separation data created in step 18 is sent to the computer 3 via the communication line 18 in step 19 and stored in the external storage device 4. At this time, the color number of the color table 30 and the halftone dot data of each color are also stored in the external storage device 4.

Thereafter, in step 21 of FIG. 7, the computer 3 reads the data stored in the external storage device 4. Step
The processing from 22 to step 26 is the same as when data is fetched from the floppy disk device 7.

The original film data thus created is sent to the data bus shown in FIG. 1 and is output to the original film set on the scanner 6 via the interface 5 to form a desired halftone dot for each color. An original film is created (S22).

(Effect of the Invention) As described above, in the present invention, the line image input by the image reading means is displayed on the image display means, and the position of the area of the line image displayed on the image display means is indicated by the coordinate designating means. And the ratio of each color of yellow, magenta, cyan, and black with respect to the area of the line image is instructed by the color instructing means, film original data for each color is created by the arithmetic control means, The film master for each color is output by the output means based on the created film master data for each color.

Therefore, according to the invention of the present application, the operator instructs the predetermined area and the color for the area while comparing the line image displayed on the image display means with the contents of the color instruction sheet. Since the original film for printing is automatically created, there is no need for the work of making a mask plate and the work of printing a flat mesh onto the film original plate, which has been done by hand in the past. There is an effect that the efficiency of the above can be significantly improved, the material cost of the mask plate, the flat screen, etc. can be saved, and the precision of the film original plate for plain net can be improved without any misregistration by manual work.

Further, in the present invention, the read image data is squarely divided and stored in the storage device, and the squared image data is displayed on the image display means. Therefore, the operator can accurately instruct the image displayed on the image display means when performing the pattern correction process, the embankment creation process, or the hit ruled line process. Can be made.

[Brief description of drawings]

FIG. 1 is a block diagram of an apparatus showing an example of the present invention, FIG. 2 is a flowchart showing processing of image data captured by the scanner 1 shown in FIG. 1, and FIG. 3 is step 7 in FIG. FIG. 4 is an explanatory diagram of stored image data, FIG. 4 is a flowchart showing data processing in the color separation device 10 shown in FIG. 1, and FIG. 5 is an example of an image displayed on the display 12 of FIG. FIG. 6 is an explanatory view showing an example of a color table used for the color separation processing in step 18 of FIG. 4, and FIG. 7 is a film original data creation by the computer 3 shown in FIG. Flowchart showing processing, eighth
FIG. 9 is an explanatory view showing an example of a solid mesh portion of a printed matter, FIG. 9 is an explanatory view showing an example of a block used in the plate making process of the printed matter 50 shown in FIG. 8, and FIG. 10 is FIG. 11A and 11B are explanatory views showing an example of a color instruction sheet used in the plate making process of the printed matter 50 shown in FIG. 11, and FIGS. 11A and 11B are positive and negative images obtained by taking a picture of the block 60 shown in FIG. Figure, Figure 12 (a), (b),
(C), (d) and (e) are explanatory views showing an example of a mask used when the printed matter 50 shown in FIG. 8 is produced by a conventional plate making process, and FIG. 13 is shown in FIG. FIG. 8 is an explanatory diagram of a process when the printed matter 50 is created by a conventional plate making process. 6 …… Output scanner 7 …… Floppy disk device 10 …… Color separation device 15 …… Floppy disk device 30 …… Color table 50 …… Printed matter 60 …… Work block 61 …… Color instructions 71 …… Positive 72 …… Negative 81, 82, 83, 84, 85 …… Mask 91, 92, 93, 94, 95, 96 …… Flat screen

Continuation of the front page (56) Reference JP-A-56-55949 (JP, A) JP-A-56-140349 (JP, A) JP-A-60-222857 (JP, A) JP-B-55-25654 (JP , B2)

Claims (1)

[Claims] 1. An image reading unit for reading a line image drawn on a document, a storage unit for storing the image data read by the image reading unit in a rectangular form, and image data stored in the storage unit. Image display means for reading and displaying the line image, coordinate designating means for designating the position of the area of the line image displayed on the image display means, and yellow, magenta, cyan, and black for the area of the line image. And a film for each color based on the ratio of each color of yellow, magenta, cyan, and black instructed by the color instructing device by combining the image data divided into squares. Arithmetic control means for creating original data, and output means for outputting a film original for each color based on the film original data A film original plate making device for a solid-colored net.