JP6874808B2 - Plate making method, plate making system and can body - Google Patents

Description

The present invention relates to a plate making method, a plate making system, and a can body.

A printing plate attached to a printing machine that performs multicolor printing is produced so that colors can be expressed by overprinting a plurality of process colors (for example, Patent Document 1).

In Patent Document 1, after the color-separated basic four-color image data is meshed, the color is changed to seven-color image data that does not overlap with each other, and the color-changed seven-color image data is subjected to ink. A plate making method is described in which an image shrinkage process is performed so that turbidity of the ink does not occur due to bleeding or mechanical misalignment of the printing machine, and a printing plate for each color is produced based on the image data obtained by the shrinkage process.

Special Fair 7-57543 Gazette

In the technique described in Patent Document 1, since the image shrinkage processing is performed on the halftone dot image data, the background color is easily exposed and the color gamut, which is a reproducible color region, is easily limited. On the contrary, in the technique described in Patent Document 1, turbidity of ink is likely to occur unless image shrinkage processing is performed in order to secure a wide color gamut. Further, in the technique described in Patent Document 1, if halftone dot image data is not subjected to image shrinkage processing, halftone dots of seven colors are printed and overlapped, so that moire is likely to occur.

The present invention has been made in view of the above circumstances, and it is an example of a problem to solve the above-mentioned problems. That is, one example of the subject of the present invention is to produce a printing plate capable of suppressing the occurrence of moire and suppressing the turbidity of ink while ensuring a wide color gamut only with the process color. Further, as an example of the subject of the present invention, there is provided a can body printed by a method capable of suppressing the occurrence of moire and suppressing the turbidity of ink while ensuring a wide color gamut only with the process color. It is to be.

The plate-making method according to the present invention is a plate-making method for producing a printing plate capable of expressing a color by superimposing net dots of three colors among a plurality of process colors, and two of the three colors. Color printing is performed by forming punched net dots on one of the two colors and printing the grid dots of the other color on the punched positions. Overprinting of the remaining color and the two colors is performed by multiplying at least a part of the mesh dots of the remaining colors on the mesh dots of the one color and / or the mesh dots of the other color. It is characterized by using a matching method.

Preferably, in the plate making method, the one color belongs to the first color group composed of colors having hue components that do not overlap with each other, and the other color is a color having hue components that do not overlap with each other. It is characterized in that it belongs to a second color group composed of colors different from the colors belonging to the first color group.

Preferably, in the plate making method, the plurality of process colors are seven colors of cyan, magenta, yellow, red, green, blue and black, and the first color group is composed of cyan, magenta and yellow. The second color group is composed of red, green and blue, and the remaining color is black.

Preferably, in the plate making method, the halftone dots of the remaining colors are arranged at a screen angle different from that of the two color dots.

Preferably, in the plate-making method, the printed matter of the printing plate is a two-piece can or a metal plate.

The plate-making system according to the present invention is a plate-making system for producing a printing plate capable of expressing a color by superimposing net dots of three colors among a plurality of process colors, and two of the three colors. The color printing is performed by forming a punched net dot on one of the two colors and printing the punched net spot on the other color at the punched position. In the printing of the remaining color and the two colors, at least a part of the mesh dots of the remaining colors is multiplied by the mesh dots of the one color and / or the mesh dots of the other color. It is characterized by using a matching method.

The can body according to the present invention is a can body that has been printed to express a color by superimposing net dots of three colors among a plurality of process colors, and two colors out of the three colors. The printing of the above two colors is performed by a drawing method in which punched net dots are formed on one of the two colors and the net dots of the other color are printed on the punched positions. In the printing of the remaining color of the two colors and the two colors, at least a part of the mesh dots of the remaining colors rides on the mesh dots of the one color and / or the mesh dots of the other color. The feature is that it is performed by a crossing method.

According to the present invention, it is possible to produce a printing plate capable of suppressing the occurrence of moire and suppressing the turbidity of ink while ensuring a wide color gamut only with the process color. Further, according to the present invention, it is provided a can body printed by a method capable of suppressing the occurrence of moire and suppressing the turbidity of ink while ensuring a wide color gamut only with the process color. Can be done.

It is a figure which shows the structure of the plate making system which concerns on this embodiment. It is a figure for demonstrating the hue circle decomposition. It is a figure which summarized the component range of each color extracted by the color separation in the hue circle decomposition into each of the 1st color group and the 2nd color group. It is a figure for demonstrating an example in which two colors extracted by the color separation by the hue circle separation are printed by the extraction method or the multiplication method. It is a figure for demonstrating a specific example of color separation of a target color. It is a figure which shows the flow of the plate making method for making a printing plate using the plate making system shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below show some examples of the present invention and do not limit the content of the present invention. Moreover, not all of the configurations and operations described in the embodiments are essential as the configurations and operations of the present invention.

[Plate making system configuration]
FIG. 1 is a diagram showing a configuration of a plate making system 1 according to the present embodiment.

The plate-making system 1 is a system for producing a printing plate to be attached to a plate-type printing machine. The plate making system 1 is a system that employs DTP (Desktop Publishing) and CTP (Computer To Plate). The plate making system 1 is a system for producing a printing plate for multicolor printing.

The printed matter of the printing plate produced by the plate making system 1 is a can body having a substantially cylindrical shape such as a two-piece can, or a flat metal plate. Further, the plate making system 1 is a system for producing a printing plate to be attached to an offset printing machine that transfers ink via an intermediate transfer body or a non-offset printing machine that does not use an intermediate transfer body.

In FIG. 1, a printing plate attached to an offset printing machine 30 in which a can body having a substantially cylindrical shape such as a two-piece can is used as a printed matter and ink is transferred to the outer peripheral surface of the can body via an intermediate transfer body. The plate making system 1 for producing the above is exemplified. The printing plate produced by the plate making system 1 shown in FIG. 1 is preferably a waterless planographic plate in which a non-image area on which ink does not adhere is formed of a silicone resin layer or the like and no dampening water is used. .. Further, the printing plate produced by the plate making system 1 shown in FIG. 1 may be a resin letterpress whose image line portion on which the ink is placed is formed of a photosensitive resin layer or the like.

The plate-making system 1 includes a data processing device 10 that performs various image processing on the original image data to create image data for plate-making, and a plate-making device 20 that produces a printing plate according to the image data for plate-making.

The data processing device 10 edits the original image data expressed in the page description language, such as layout and color tone correction. Then, the data processing device 10 performs a plate separation process for performing color separation and the like, and a halftone dot conversion process for expressing the shade of each color as a set of halftone dots to create image data for plate making, and the plate making device 20 Send to. The data processing device 10 includes a processor and a storage device, and also includes a program that implements the functions of the data processing device 10.

The data processing device 10 includes a plate separation processing unit 11 that performs plate separation processing, a halftone dot conversion condition setting unit 12 that sets conditions for halftone dot processing, and a halftone dot processing unit 13 that performs halftone dot processing. It is provided with a transmission processing unit 14 that performs data transmission processing to the plate making apparatus 20.

The separation processing unit 11 color-separates the edited manuscript image data for each process color, and creates the separation image data which is the image data for each color extracted by the color separation. The process colors of the present embodiment are, for example, seven colors of cyan C, magenta M, yellow Y, red R, green G, blue B, and black K. Details of color separation will be described later with reference to FIGS. 2 to 5.

The halftone dot conversion condition setting unit 12 sets the halftone dot conversion condition, which is a condition for halftone dot conversion of the separation image data created by the plate separation processing unit 11. The halftone dot setting condition is set for each color separation image data. The halftone dot formation conditions include the halftone dot shape for each color, the halftone dot area ratio, the number of screen lines and the screen angle, as well as the conditions related to the extraction method and the multiplication method.

The plate making system 1 produces a printing plate capable of expressing a color other than each process color extracted by color separation by printing inks of each process color extracted by color separation. At this time, when the plate making system 1 performs color separation by the method described later using FIGS. 2 to 5, the target color to be expressed is two colors of each process color extracted by the color separation. It is possible to produce a printing plate that can be expressed by overprinting or overprinting three colors.

When the plate making system 1 expresses the target color by superimposing two colors of each process color extracted by color separation, the plate making system 1 produces a printing plate capable of superimposing these two colors by a sampling method. To make. Further, when the plate making system 1 expresses the target color by superimposing three colors of each process color extracted by color separation, two of these three colors are printed by a combination method. A printing plate that can be overlaid and the remaining one color can be overprinted by a crossing method is produced.

The drawing method is a method in which halftone dots of the other color are formed on one of the two colors to be printed, and halftone dots of the other color are printed at the positions where the halftone dots are formed. .. In the pull-out method, the inks of one color and the inks of the other color are printed without contacting each other as much as possible.

The crossing method is a method of overprinting without forming halftone dots in either of the two colors to be overprinted. In the crossing method, at least a part of the halftone dots of the other color is placed on the halftone dots of one of the two colors to be printed, so that the ink of one color and the ink of the other color come into contact with each other. It is printed over and over again.

The halftone dot setting condition setting unit 12 specifies the divided image data of the two colors to be the target of the sampling method and the color to be the target of the multiplication method. Then, the halftone dot conversion condition setting unit 12 sets the halftone dot area ratio for each pixel of the designated separation image data. Details of the halftone dot formation conditions related to the extraction method and the multiplication method will be described later with reference to FIGS. 2 to 5.

The halftone dot conversion processing unit 13 halftones the divided image data created by the plate separation processing unit 11 according to the halftone dot conversion conditions set by the halftone dot conversion condition setting unit 12. The halftone dot image data is binary data such as, for example, 1 bit TIFF (Tagged Image File Format). The halftone dot image data is used as image data for plate making when the plate making apparatus 20 makes a printing plate. The halftone dot processing unit 13 may be configured by software RIP (Raster Image Processor) or the like.

When halftone-dotting image data of each of the two colors to be subjected to the sampling method is halftone-dotted, the halftone dot conversion processing unit 13 sets one color of the two colors and the other color under different conditions. Make halftone dots. Specifically, when the halftone dot conversion processing unit 13 halftones the separation image data of one of the two colors, the halftone dot conversion image data of one color is shaded by one color. The inverted inverted image data is once created, and the created inverted image data is halftone-dotted under negative conditions. The negative condition is a condition in which the lower the color density of a pixel, the higher the halftone dot area ratio. On the other hand, when the halftone dot conversion processing unit 13 halftones the divided image data of the other color of the two colors, the halftone dot conversion image data of the other color is halftone-dotted as it is under a positive condition. .. The positive condition is a condition in which the higher the color density of a pixel, the higher the halftone dot area ratio.

The transmission processing unit 14 performs a process of transmitting the halftone-dotted image data of the halftone-dotted processing unit 13 to the plate making apparatus 20 as image data for plate making.

The plate making device 20 prepares a printing plate for each color according to the image data transmitted from the transmission processing unit 14 of the data processing device 10, that is, the image data that is halftone-dotted for each color. The plate making device 20 is preferably a device for making the above-mentioned waterless planographic plate. The plate making apparatus 20 performs laser exposure on the silicone resin layer based on the image data that is halftone-dotted for each color, peels off the cured silicone resin layer, and develops the image area and the non-image area. By forming the portion, a printing plate can be produced.

[About color separation, extraction method and multiplication method]
FIG. 2 is a diagram for explaining the color wheel decomposition. FIG. 3 is a diagram in which the component ranges of each color extracted by the color separation in the hue circle separation are summarized in each of the first color group and the second color group. FIG. 4 is a diagram for explaining an example in which two colors extracted by color separation in hue ring separation are overprinted by a pull-out method or a crossing method.

When the original image data is color-separated, the plate separation processing unit 11 separates the original image data into a lightness component and a hue component and separates the original image data. Specifically, the plate separation processing unit 11 extracts the lightness component as a component of black K by GCR (gray component replacement), and extracts the hue component as cyan C, magenta M, yellow Y, and red R by hue ring decomposition. , Green G or Blue B.

Hue ring decomposition is a method of decomposing and extracting the hue components of the target color into cyan C, magenta M, yellow Y, red R, green G, or blue B components in a well-balanced manner based on the color wheel. is there. In the hue circle decomposition, the hue component of the target color is represented by each component of cyan C, magenta M, and yellow Y, and the mixed color portion of magenta M and yellow Y is the component of red R, and the mixed color portion of yellow Y and cyan C. Is replaced with the component of green G, and the mixed color portion of cyan C and magenta M is replaced with the component of blue B, respectively.

In the hue circle decomposition, the target hue components are color-separated in a well-balanced manner by using the three primary colors of a reduced color mixture of cyan C, magenta M and yellow Y and the three primary colors of a color mixture of red R, green G and blue B. Therefore, in principle, all colors represented by the color wheel can be reproduced, and a wide color gamut can be secured. Therefore, in the present embodiment, six colors of cyan C, magenta M, yellow Y, red R, green G and blue B and seven colors of black K are used as process colors, and these colors are printed over and over again. Represents colors other than process colors.

FIG. 2A shows the range of components extracted in each of cyan C, magenta M, yellow Y, red R, green G, and blue B when the color wheel is color-separated by the color wheel decomposition. ing. FIG. 2B shows the range of components extracted by each of cyan C, magenta M, and yellow Y when the color wheel is color-separated only by cyan C, magenta M, and yellow Y.

Comparing FIG. 2A and FIG. 2B, when the color wheel is color-separated by the color wheel separation, the color separation of the color wheel is compared with the case where the color wheel is color-separated only by cyan C, magenta M, and yellow Y. It can be seen that the range of components extracted in each color is narrowed. For this reason, when the hue components are color-separated by the hue circle separation and two colors other than black K are overprinted by the multiplication method, one of the two colors and the other color overlap. The area of the part can be small. Therefore, by color-separating the hue component by hue ring decomposition, it is possible to suppress turbidity of inks other than black K while ensuring a wide color gamut.

Here, in the present embodiment, among the six colors extracted by color-decomposing the hue component by the hue circle decomposition, a color group composed of cyan C, magenta M, and yellow Y, which are the three primary colors of the color-reducing mixture, is selected. The first color group is defined as a color group composed of red R, green G, and blue B, which are complementary colors to these and are the three primary colors of the color mixture, and is defined as the second color group.

The respective component ranges of cyan C, magenta M, and yellow Y that make up the first color group do not overlap each other, as shown apart in FIG. Similarly, the respective component ranges of Red R, Green G, and Blue B constituting the second color group do not overlap each other as shown apart in FIG. That is, the first color group is composed of cyan C, magenta M, and yellow Y, which are colors having hue components that do not overlap with each other, and the second color group is red R, green, which are colors having hue components that do not overlap with each other. It is composed of G and Blue B.

As described above, if two colors other than black K extracted by color separation in the hue circle separation are overprinted by a crossing method, the area of the overlapping part of the colors can be small, but the color gamut can be secured. Overlapping of colors is unavoidable to some extent, and there is a possibility that ink turbidity may occur when reprinted. However, when these two colors are overprinted by a pull-out method, the two colors can be overprinted without the respective inks coming into contact with each other as much as possible. Further, when one color belonging to the above-mentioned first color group and one color belonging to the second color group are overprinted by a pull-out method, the three primary colors of the reduced color mixture, cyan C, magenta M, and yellow Y, are printed. Compared to the case where two of these colors are printed by the pull-out method, two colors with closer tones are printed by the pull-out method, so even if these two colors come into contact, the ink becomes turbid. It can be less likely to occur.

Therefore, in the plate making system 1, when the hue component of the original image data is expressed by printing two colors other than black K extracted by the color separation in the hue circle separation, the halftone dot setting condition setting unit 12 is used. It is set so that these two colors can be printed on top of each other by a pull-out method. In particular, when one of the two colors belongs to the first color group and the other color belongs to the second color group, the halftone dot setting condition setting unit 12 belongs to the first color group. And the other color belonging to the second color group are set so as to be overprinted by a pull-out method. As a result, the plate making system 1 can produce a printing plate having a wide color gamut and capable of suppressing ink turbidity as much as possible.

FIG. 4A shows an example in which cyan C and green G extracted by color separation in the hue circle separation are overprinted by a pull-out method. In the example of FIG. 4A, a blank is formed at a position where one color of cyan C and green G is placed on the other color, and halftone dots of the other color of cyan C and green G are of one color. It can be seen that it is located in the part where the punch is formed.

In FIG. 4 (b), cyan C and green G extracted by color separation by hue ring separation were overprinted by a crossing method with the same halftone dot area ratio as in FIG. 4 (a). An example is shown. In the example of FIG. 4B, it can be seen that at least a part of the halftone dots of the other color is on the halftone dots of one color of cyan C and green G. Further, in the example of FIG. 4B, it can be seen that the white W, which is the background color, is exposed.

Comparing FIGS. 4 (a) and 4 (b), in the drawing method, the contact between the inks is suppressed and the color of the background is easily concealed, so that the color gamut is wider and flatter than that in the crossing method. A high density can be obtained even with a net.

Further, in the plate making system 1, the plate separation processing unit 11 extracts the brightness component of the original image data as a black K component by GCR. The plate-making system 1 produces a printing plate so that the brightness component of the original image data can be expressed by printing the extracted black K on a color other than the black K that expresses the hue component. In the plate making system 1, when expressing the brightness component of the original image data, the halftone dot setting condition setting unit 12 prints the black K on the colors other than the black K expressing the hue component by a multiplication method. Set. By adopting the multiplication method, it is not necessary to match the screen angle and the number of screen lines of the halftone dots of black K with the screen angle and the number of screen lines of the halftone dots of two colors other than black K, and it can be set freely. become. At this time, the halftone dot setting condition setting unit 12 sets the screen angle and the number of screen lines of the halftone dots of the black K to values that can suppress the occurrence of moire. In order to suppress the occurrence of moiré, it is preferable that the halftone dots of black K have a screen angle different from the halftone dots of two colors other than black K, which are printed by the pull-out method.

When an ink of a color other than black K is applied to the ink of black K, the wet black K ink is transferred to a printing plate of a color other than black K, and the printing plate is transferred from this printing plate via a foam roller or the like. It may be mixed in ink jars of colors other than black K. Then, the ink of a color other than black K becomes turbid with the ink of black K, the color tone deteriorates, and there is a possibility that the ink cannot be used immediately.

On the other hand, when the black K ink is applied to the ink other than black K, even if the wet ink of a color other than black K is transferred to the printing plate of black K and mixed in the ink jar, the black K ink is used. The color tone of the ink does not change much, and it is difficult for it to become unusable immediately. Therefore, when the black K ink is applied to the ink other than the black K ink, the turbidity of the ink can be suppressed as compared with the above case.

Therefore, in the plate making system 1, when expressing the brightness component of the original image data, the halftone dot setting condition setting unit 12 prints the colors other than the black K expressing the hue component by multiplying the black K by a multiplication method. Set to be. As a result, the plate making system 1 can produce a printing plate capable of suppressing the occurrence of moire and suppressing the turbidity of inks of colors other than black K with black K.

Therefore, in the plate making system 1, the plate separation processing unit 11 decomposes the hue component of the original image data into each component of cyan C, magenta M, yellow Y, red R, green G, and blue B. Color-separate with. Then, in the plate making system 1, when the hue component of the original image data is expressed by printing two process colors other than black K, the halftone dot setting condition setting unit 12 prints these two process colors by a sampling method. Set so that they can be stacked. Further, in the plate making system 1, when expressing the brightness component of the original image data, the halftone dot setting condition setting unit 12 prints the process colors other than the black K expressing the hue component by the black K by the multiplication method. Set so that they can be stacked.

That is, in the plate making system 1, among the above-mentioned seven process colors, two colors other than black K expressing the hue component of the original image data and three colors of black K expressing the brightness component of the original data To produce a printing plate that expresses a predetermined color by overprinting. Then, in the plate making system 1, the printing of two colors expressing the hue component of the three colors to be overprinted is used as a combination method, and black K, which is the remaining color of the three colors, and the hue component are used. The printing method is to multiply the two colors that express the above. Then, in the plate making system 1, two colors other than black K expressing the hue component of the original image data are used as one color of cyan C, magenta M, and yellow Y belonging to the first color group, and the second color. The color is one of Red R, Green G, and Blue B belonging to the group. Thereby, in the plate making system 1, it is possible to produce a printing plate capable of suppressing the occurrence of moire and suppressing the turbidity of the ink while ensuring a wide color gamut only with the process color.

FIG. 5 is a diagram for explaining a specific example of color separation of the target color.

FIG. 5 shows an example in which the target color is composed of cyan C having a density of 80%, magenta M having a density of 70%, and yellow Y having a density of 50%. The total value of the densities of each color is 200%.

When the target color is color-separated, the plate-making system 1 first extracts a mixed color portion of three colors of cyan C, magenta M, and yellow Y as a component of black K by GCR. Thereby, the target color is replaced with a color composed of black K having a density of 50%, cyan C having a density of 30%, and magenta M having a density of 20%. The total value of the densities of each color is reduced to 100%.

Next, the plate-making system 1 extracts a mixed color portion of the two colors of cyan C and magenta M as a component of blue B by hue circle decomposition. Thereby, the target color is replaced with a color composed of black K having a density of 50%, blue B having a density of 20%, and cyan C having a density of 10%. The total density of each color is reduced to 80%.

As described above, the plate making system 1 can suppress the generation of moire and suppress the turbidity of the ink while ensuring a wide color gamut only by the process color by color separation by GCR and hue ring decomposition. , A printing plate capable of reducing the amount of ink used can be produced.

[Plate making method using plate making system]
FIG. 6 is a diagram showing a flow of a plate making method for producing a printing plate using the plate making system 1 shown in FIG.

Steps S601 to S606 shown in FIG. 6 may be executed by the data processing device 10 based on an operation command from the user input via the user interface provided in the data processing device 10. Step S607 shown in FIG. 6 may be performed by the plate making apparatus 20.

In step S601, the plate making system 1 submits the original image data by the data processing device 10.

In step S602, the plate making system 1 edits the submitted manuscript image data. The plate-making system 1 edits the original image data by modifying the layout or correcting the color tone according to the print area of the printed matter.

In step S603, the plate making system 1 performs a plate separation process on the edited manuscript image data. The plate-making system 1 color-separates the edited manuscript image data for each process color and creates plate-separated image data for each color.

In step S604, the plate making system 1 performs halftone dot conversion condition setting processing for setting halftone dot conversion conditions when halftone dot conversion image data created by the plate separation process is made into halftone dots. In particular, the plate making system 1 designates each of the divided image data of one color and the other color to be the target of the sampling method, and for each pixel of the specified divided image data, one color and the other Set the halftone dot area ratio of the color. One color to be subjected to the pull-out method is one of cyan C, magenta M and yellow Y belonging to the first color group, and the other color is red R and green belonging to the second color group. It is one color of G and blue B. Further, the plate-making system 1 specifies the plate-separated image data of the color to be the target of the multiplication method, and sets the halftone dot area ratio, the number of screen lines, the screen angle, and the like. The target color of the crossing method is black K.

In step S605, the plate making system 1 halftones the halftone image data created by the halftone separation process according to the halftone dot conversion conditions set in the halftone dot conversion setting process. In particular, in the plate making system 1, when the separation image data of one color to be the target of the sampling method is halftone-dotted, the inversion image in which the shade of one color is inverted in the separation image data of one color. Data is created, and the created inverted image data is halftone-dotted under negative conditions. On the other hand, in the plate making system 1, when the separation image data of the other color, which is the target of the sampling method, is halftone-dotted, the separation image data of the other color is halftone-dotted as it is under the positive condition. Further, the plate-making system 1 makes halftone dots of the color-separated image data of the color to be the target of the multiplication method as it is under positive conditions.

In step S606, the plate making system 1 performs a transmission process of transmitting the halftone dot image data obtained by the halftone dot making process from the data processing device 10 to the plate making device 20 as image data for plate making.

In step S607, the plate making system 1 produces a printing plate for each color by the plate making apparatus 20 according to the image data transmitted in the transmission process. The plate-making method shown in FIG. 6 ends in this step.

[Action effect]
As described above, the plate-making system 1 according to the present embodiment is a plate-making system that produces a printing plate capable of expressing colors by printing halftone dots of three colors out of a plurality of process colors. Then, in the plate-making system 1 according to the present embodiment, two of the three colors are printed in a drawing method, and the remaining colors of the three colors are printed in a drawing method. The printing method with the two colors is multiplied. Thereby, in the plate making system 1, it is possible to produce a printing plate capable of suppressing the occurrence of moire and suppressing the turbidity of the ink while ensuring a wide color gamut only with the process color.

Further, in the plate making system 1 according to the present embodiment, one color to be selected by the sampling method belongs to the first color group composed of colors having hue components that do not overlap with each other, and the other is subject to sampling. The colors belong to the second color group composed of colors having hue components that do not overlap with each other. That is, one color and the other color belong to different color groups, and there is a possibility that these component ranges overlap. However, in the plate making system 1 according to the present embodiment, these component ranges overlap. However, due to the pull-out method, it is possible to reprint the inks without contacting them as much as possible. Therefore, in the plate making system 1 according to the present embodiment, it is possible to produce a printing plate capable of suppressing the occurrence of moire and further suppressing the turbidity of ink while ensuring a wide color gamut only with the process color. Can be done.

Further, in the plate making system 1 according to the present embodiment, the plurality of process colors are seven colors of cyan C, magenta M, yellow Y, red R, green G, blue B and black K. In the plate making system 1 according to the present embodiment, the first color group is composed of cyan C, magenta M, and yellow Y, and the second color group is composed of red R, green G, and blue B, as described above. The remaining color of the three colors is black K. That is, in the plate making system 1 according to the present embodiment, since the first color group is composed of the three primary colors of the subtractive color mixture and the second color group is composed of the three primary colors of the additive color mixture, it can be secured only by the process color. A printing plate capable of further expanding the color gamut can be produced. In addition, in the plate making system 1 according to the present embodiment, since the target color of the multiplication method is black K, it is possible to further suppress the turbidity of inks of colors other than black K with black K. A printing plate can be produced. Therefore, the plate making system 1 according to the present embodiment produces a printing plate capable of further expanding the color gamut that can be secured only by the process color and further suppressing the turbidity of the ink while suppressing the occurrence of moire. can do.

Further, in the plate making system 1 according to the present embodiment, the halftone dots of the remaining colors of the above three colors are arranged at a screen angle different from the halftone dots of the two colors that are the targets of the sampling method. Therefore, in the plate making system 1 according to the present embodiment, even if the halftone dots of the remaining three colors are printed by the crossing method, the occurrence of moire can be suppressed. Therefore, the plate making system 1 according to the present embodiment manufactures a printing plate capable of suppressing ink turbidity and further suppressing the occurrence of moire while ensuring a wide color gamut only with process colors. Can be done.

Further, in the plate making system 1 according to the present embodiment, a printing plate using a two-piece can or a metal plate as a printed matter is produced. Since the printed surface of a two-piece can or metal plate is a surface that does not allow ink to penetrate, it is possible to suppress ink turbidity while ensuring the color gamut only with the process color in the conventional printing plate. This poses a greater problem than in the case of printed matter such as. The plate-making system 1 according to the present embodiment produces a printing plate capable of expressing colors by printing halftone dots of three colors among a plurality of process colors even if the printed matter is a two-piece can or a metal plate. can do. Therefore, in the plate making system 1 according to the present embodiment, even if the printed matter is a two-piece can or a metal plate, the occurrence of moire is suppressed while ensuring a wide color gamut only with the process color, and the ink becomes turbid. It is possible to produce a printing plate capable of suppressing the above.

Further, in the can body printed by using the plate making system 1 according to the present embodiment, two of the three colors are overprinted by a pull-out method, and the remaining colors of the three colors are printed. And, the printing with the two colors printed by the pull-out method is performed by the multiplying method. As a result, the can body printed using the plate making system 1 according to the present embodiment can secure a wide color gamut only by the process color, suppress ink turbidity, and further suppress the generation of moire. Can be a can body with

[Other Embodiments]
In the above-described embodiment, the process colors handled by the plate-making system 1 are seven colors of cyan C, magenta M, yellow Y, red R, green G, and blue B, but are not limited thereto. For example, the process colors handled by the plate making system 1 may be six colors of cyan C, magenta M, yellow Y, orange O, green G, and black K. In this case, the first color group may be a color group composed of cyan C, magenta M, and yellow Y, and the second color group may be a color group composed of orange O and green G.

In the above-described embodiment, the plate making system 1 is a system for producing a printed plate using a can body such as a two-piece can or a metal plate as a printed matter. The plate making system 1 is not limited to this, and may be a system for producing a printing plate using a three-dimensional object of a non-metal material such as a bottle or a bottle as a printed matter. Further, the plate making system 1 may be a system for producing a printed plate using a flat object such as paper, a label, a film or a sheet as a printed matter.

[Other]
In the above-described embodiments, the techniques can be applied to each other, including modifications. The above-described embodiment does not limit the content of the present invention, and can be modified to the extent that it does not deviate from the scope of claims.

The terms used in the above embodiments and claims should be construed as non-limiting terms. For example, the term "contains" should be construed as "not limited to what is described as including." The term "contains" should be construed as "not limited to what is described as containing." The term "prepared" should be construed as "not limited to what is described as prepared." The term "have" should be construed as "not limited to what is described as having."

1 Plate making system 10 Data processing device 11 Separation processing unit 12 Halftone dot conversion condition setting unit 13 Halftone dot conversion processing unit 14 Transmission processing unit 20 Plate making equipment 30 Offset printing machine B Blue C Cyan G Green K Black M Magenta R Red Y Yellow W white

Claims (9)

It is a plate making method for producing a printing plate capable of expressing a color by printing halftone dots of three colors out of a plurality of process colors.
Overtone dots of two of the three colors are printed on one of the two colors to form halftone dots of the other color, and halftone dots of the other color are overprinted at the positions of the cutouts. As a matching method,
Overtones of the remaining colors of the three colors and the two colors are performed so that at least a part of the halftone dots of the remaining colors is the halftone dots of the one color and / or the halftone dots of the other color. It is a crossing method that rides on halftone dots .
One of the colors belongs to the first color group composed of colors having hue components that do not overlap with each other.
The plate-making method, wherein the other color is a color having hue components that do not overlap with each other and belongs to a second color group composed of a color different from the color belonging to the first color group. The plurality of process colors are seven colors of cyan, magenta, yellow, red, green, blue and black.
The first color group is composed of cyan, magenta and yellow.
The second color group is composed of red, green and blue.
The plate-making method according to claim 1 , wherein the remaining color is black. The plate-making method according to claim 1 or 2, wherein the halftone dots of the remaining colors are arranged at a screen angle different from that of the two color dots. It is a plate making method for producing a printing plate capable of expressing a color by printing halftone dots of three colors out of a plurality of process colors.
Overtone dots of two of the three colors are printed on one of the two colors to form halftone dots of the other color, and halftone dots of the other color are overprinted at the positions of the cutouts. As a matching method,
Overtones of the remaining colors of the three colors and the two colors are performed so that at least a part of the halftone dots of the remaining colors is the halftone dots of the one color and / or the halftone dots of the other color. It is a crossing method that rides on halftone dots .
A plate-making method , wherein the halftone dots of the remaining colors are arranged at a screen angle different from that of the two color dots. The plate-making method according to any one of claims 1 to 4, wherein the printed matter of the printing plate is a two-piece can or a metal plate. It is a plate making method for producing a printing plate capable of expressing a color by printing halftone dots of three colors out of a plurality of process colors.
Overtone dots of two of the three colors are printed on one of the two colors to form halftone dots of the other color, and halftone dots of the other color are overprinted at the positions of the cutouts. As a matching method,
Overtones of the remaining colors of the three colors and the two colors are performed so that at least a part of the halftone dots of the remaining colors is the halftone dots of the one color and / or the halftone dots of the other color. It is a crossing method that rides on halftone dots .
A plate-making method, wherein the printed matter of the printing plate is a two-piece can or a metal plate. It is a plate making system that produces a printing plate that can express colors by printing halftone dots of three colors out of a plurality of process colors.
In the printing of two of the three colors, halftone dots of the other color are formed in one of the two colors, and halftone dots of the other color are printed at the positions of the blanks. As a matching method,
In the printing of the remaining colors of the three colors and the two colors, at least a part of the halftone dots of the remaining colors is the halftone dots of the one color and / or the halftone dots of the other color. It is a crossing method that rides on halftone dots .
A plate-making system characterized in that the remaining color halftone dots are arranged at a screen angle different from that of the two color halftone dots. It is a plate making system that produces a printing plate that can express colors by printing halftone dots of three colors out of a plurality of process colors.
In the printing of two of the three colors, halftone dots of the other color are formed in one of the two colors, and halftone dots of the other color are printed at the positions of the blanks. As a matching method,
In the printing of the remaining colors of the three colors and the two colors, at least a part of the halftone dots of the remaining colors is the halftone dots of the one color and / or the halftone dots of the other color. It is a crossing method that rides on halftone dots .
A plate-making system, wherein the printed matter of the printing plate is a two-piece can or a metal plate. It is a can body that is printed to express colors by printing halftone dots of three colors out of multiple process colors.
In the printing of two of the three colors, halftone dots of the other color are formed in one of the two colors, and halftone dots of the other color are printed at the positions of the blanks. It is done by the matching method,
In the printing of the remaining colors of the three colors and the two colors, at least a part of the halftone dots of the remaining colors is the halftone dots of the one color and / or the halftone dots of the other color. A can body characterized by being carried out by a crossing method that rides on halftone dots.

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