CN110774729B - High-fidelity offset printing method based on seven primary colors - Google Patents

High-fidelity offset printing method based on seven primary colors Download PDF

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CN110774729B
CN110774729B CN201910980245.8A CN201910980245A CN110774729B CN 110774729 B CN110774729 B CN 110774729B CN 201910980245 A CN201910980245 A CN 201910980245A CN 110774729 B CN110774729 B CN 110774729B
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color
primary
colors
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CN110774729A (en
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刘祖斌
陆亚英
谭荣洪
肖小清
陈锦彬
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Zhongrong Printing Group Co ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00Inking and printing with a printer's forme
    • B41M1/06Lithographic printing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F7/00Rotary lithographic machines
    • B41F7/02Rotary lithographic machines for offset printing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F7/00Rotary lithographic machines
    • B41F7/20Details
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/10File systems; File servers
    • G06F16/14Details of searching files based on file metadata
    • G06F16/148File search processing

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  • General Engineering & Computer Science (AREA)
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Abstract

The invention discloses a high-fidelity offset printing method based on seven primary colors, which comprises the following steps: a. preparing spot color ink; b. generating a CXF file corresponding to each Pantong special color; c. forming a source target spectrum database; d. generating a seven-primary color gamut table; e. printing a seven-primary color gamut table sample sheet; f. generating a high-fidelity characteristic file; g. establishing a conversion curve library; h. and (7) printing the product. The method obtains a conversion curve required by converting color blocks in a seven-primary color gamut sheet into target colors according to the target colors of printed products, combines a conversion relation between the color blocks in a high-fidelity characteristic file and the seven primary colors, obtains a preparation proportion and a preparation logic of the target colors mixed by the seven primary colors, further realizes offset printing of the target colors containing different pantone special colors by using the seven primary colors only, avoids the need of configuring the special colors before each printing, greatly improves the printing efficiency, and can ensure the color uniformity of the output products.

Description

High-fidelity offset printing method based on seven primary colors
Technical Field
The invention relates to a high-fidelity offset printing method based on seven primary colors.
Background
The Pantone color card is an international universal standard color card, is a color authority which is in the reputation of the world, covers color communication systems in the fields of printing, textile, plastic, drawing, digital science and technology and the like, and becomes an international unified standard language for exchanging color information at present.
The Pantone color card has 1876 spot colors, each spot color is mixed by at least one base ink, in the printing production, the color required by the printed matter may contain multiple spot colors, before offset printing, all the spot colors contained in the printed matter need to be modulated, then printing is carried out by an offset printing equipment machine, so that the occupied time proportion and the workload proportion of the preorder work of printing are very large, the product printing efficiency is seriously influenced, for the printed matter with less printing total amount, the printing cost is very high, and the uniformity of color matching effects of the printed matters in different batches cannot be ensured.
Moreover, the color blocks on each pantone color card are solid color blocks (i.e., color blocks with a color gradient of 100%), and in the process of printing production, color blocks with a color gradient of 0-100% are often used for color mixing, which increases the workload of workers unnecessarily and is not beneficial to mass production.
Aiming at the problems, the invention provides a high fidelity offset printing method which can mix 1876 pantone special colors by using CMYKOGB (Cyan, Magenta, Yellow, Black, Orange, Green and Blue) seven primary colors and automatically prepare the required pantone special colors to form the target color of a printed matter.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a seven-primary-color-based high-fidelity offset printing method, which can form the target color of a printed matter by replacing a pantone special color with seven primary colors of CMYKOGB, avoid the need of configuring a special color before each printing, greatly improve the printing efficiency and ensure the color uniformity of output products.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a high fidelity offset printing method based on seven primary colors comprises the following steps:
a. preparing spot color ink, and preparing corresponding spot color ink according to the formula of each Pantong spot color;
b. b, generating a CXF file corresponding to each pantone special color, printing the special color ink obtained in the step a into a color gradient table corresponding to the special color ink and an overlapped gradient table overlapped by the color gradient table and the black stripes by using offset printing equipment, and forming the CXF file corresponding to the pantone special color by the overlapped gradient table and the color gradient table;
c. forming a source target spectrum database, scanning CXF files corresponding to all the pantone special colors in sequence by using a spectrometer to obtain spectral data corresponding to all the pantone special colors, and forming the source target spectrum database by the spectral data of all the pantone special colors;
d. generating a seven-primary-color Gamut table, extracting CXF files corresponding to Cyan, Magenta, Yellow, Black, Orange, Green and Blue in the step b, inputting the CXF files of the seven primary colors into CGS ORIS X Gamut software, forming the seven-primary-color Gamut table by randomly combining color blocks in the CXF files corresponding to the seven primary colors, covering all pantone special colors in the step b by the seven-primary-color Gamut table, and outputting the seven-primary-color Gamut table as an electronic file;
e. printing a seven-primary color gamut table sample sheet, inputting an electronic file of the seven-primary color gamut table into offset printing equipment, and printing the seven-primary color gamut table sample sheet of the offset printing plate;
f. generating a high-fidelity characteristic file, and scanning the seven-primary color gamut table sample by using a spectrometer to obtain spectral data corresponding to each color block in the seven-primary color gamut table sample, wherein the spectral data corresponding to all the color blocks in the seven-primary color gamut table sample form the high-fidelity characteristic file together;
g. establishing a conversion curve library, using CGS ORIS X Gamut software to match the high-fidelity characteristic file with a source target spectrum database, so that a conversion relation is established between any pantone special color in the source target spectrum database and at least one color block in the high-fidelity characteristic file, further obtaining conversion curves required by converting each color block in the high-fidelity characteristic file into corresponding pantone special color, and forming the conversion curve library by all the conversion curves.
h. And printing a product, scanning by using a spectrometer to obtain spectral data of a target color to be printed, comparing the spectral data of the target color with the high-fidelity characteristic file to obtain more than one conversion curve in the conversion curve library, and combining a conversion relation between a color block in the high-fidelity characteristic file and seven primary colors to obtain a preparation proportion and a preparation logic of the target color by mixing the seven primary colors.
In the embodiment of the present invention, the seven-primary color gamut table includes 2116 color blocks, and the 2116 color blocks contain 1876 pantone spot colors.
In some embodiments of the present invention, step h is followed by step i, and step i comprises: the method comprises the steps of manufacturing a zinc plate, preparing ink, paper and auxiliary materials, adjusting overprinting precision and overprinting ink color, and performing trial printing and formal printing.
In some embodiments of the present invention, step i is followed by step j: and cutting the printed finished product, and packaging the cut printed finished product.
The seven-primary color-based high-fidelity offset printing method has the advantages that CXF files corresponding to all the pantone special colors are firstly formed, then a source target spectrum database consisting of spectral data of all the pantone special colors is obtained through scanning of a spectrometer, a seven-primary color Gamut table is generated in CGS ORIS X Gamma software by utilizing the CXF files of the seven primary colors, then the seven-primary color Gamut table is printed out through offset printing equipment, a high-fidelity characteristic file corresponding to a sample sheet of the seven-primary color Gamut table is obtained through scanning of the spectrometer again, a matching relation is established between the high-fidelity characteristic file and the source target spectrum database to obtain a conversion curve required by converting color blocks in the sample sheet of the seven-primary color Gamut table into corresponding pantone special colors and form a conversion curve library, and a conversion curve required by converting the color blocks in the sample sheet of the seven-primary color Gamut table into target colors is obtained according to the target colors of printed products, the method combines the conversion relation between the color blocks and the seven primary colors in the high-fidelity characteristic file to obtain the preparation proportion and the preparation logic of the target color mixed by the seven primary colors, further realizes that the target color containing different pantone special colors can be offset by only utilizing the seven primary colors, avoids the need of configuring the special colors before each printing, greatly improves the printing efficiency, and can ensure the color uniformity of output products.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic diagram of CXF files corresponding to seven primary colors, Cyan, Magenta, Yellow, Black, Orange, Green, and Blue, respectively;
FIG. 2 is a first color patch table;
FIG. 3 is a second color patch table;
fig. 4 is a third color block table.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
Referring to fig. 1 to 4, a high fidelity offset printing method based on seven primary colors includes the following steps:
a. preparing spot color ink, and preparing corresponding spot color ink according to the formula of each Pantong spot color;
b. and (b) generating a CXF file 10 corresponding to each pantone special color, printing the special color ink obtained in the step (a) into a color gradient table 11 corresponding to the special color ink, an overlapped gradient table 12 formed by overlapping the color gradient table 11 and the black stripes by using offset printing equipment, and forming the CXF file 10 corresponding to the pantone special color by using the overlapped gradient table 12 and the color gradient table 11 together.
As shown in fig. 1, the color gradient table 11 of any one of the seven primary colors (Cyan, Magenta, Yellow, Black, Orange, Green, and Blue) has color blocks with color gradients between 0% and 100%, which is helpful for forming a color gamut table with a more comprehensive color range, and all spectral data of the pantone spot color are contained in the color gradient table 11 and the superposition gradient table 12.
c. Forming a source target spectrum database, scanning the CXF files 10 corresponding to all the pantone special colors in sequence by using a spectrometer to obtain spectral data corresponding to all the pantone special colors, wherein the spectral data comprise parameters such as L, a, b, c and h in the pantone special colors, and the spectral data of all the pantone special colors form the source target spectrum database;
d. and (b) generating a seven-primary-color Gamut table, extracting CXF files 10 corresponding to Cyan, Magenta, Yellow, Black, Orange, Green and Blue in the step (b), inputting the CXF files 10 of the seven primary colors into CGS ORIS X Gamut software (color management software), forming the seven-primary-color Gamut table by randomly combining color blocks in the CXF files 10 corresponding to the seven primary colors, covering all pantone special colors in the step (b), and outputting the seven-primary-color Gamut table as an electronic file. Here, the electronic document file is a PDF electronic file.
In the embodiment of the present invention, the seven-color gamut table includes 2116 color blocks, the 2116 color blocks include 1876 pantone spot colors, the seven-color gamut table is composed of the first color block table 21, the second color block table 22, and the third color block table 23 in fig. 2 to 4, and each of the first color block table 21, the second color block table 22, and the third color block table 23 includes a plurality of color blocks.
e. Printing a seven-primary color gamut table sample sheet, inputting an electronic file of the seven-primary color gamut table into offset printing equipment, and printing the seven-primary color gamut table sample sheet of the offset printing plate;
f. generating a high-fidelity characteristic file, and scanning the seven-primary color gamut table sample by using a spectrometer to obtain spectral data corresponding to each color block in the seven-primary color gamut table sample, wherein the spectral data corresponding to all the color blocks in the seven-primary color gamut table sample form the high-fidelity characteristic file together;
g. establishing a conversion curve library, using CGS ORIS X Gamut software to match the high-fidelity characteristic file with a source target spectrum database, so that a conversion relation is established between any pantone special color in the source target spectrum database and at least one color block in the high-fidelity characteristic file, further obtaining conversion curves required by converting each color block in the high-fidelity characteristic file into corresponding pantone special color, and forming the conversion curve library by all the conversion curves.
h. And printing a product, scanning by using a spectrometer to obtain spectral data of a target color to be printed, comparing the spectral data of the target color with the high-fidelity characteristic file to obtain more than one conversion curve in the conversion curve library, and combining a conversion relation between a color block in the high-fidelity characteristic file and seven primary colors to obtain a preparation proportion and a preparation logic of the target color by mixing the seven primary colors.
The seven-primary color-based high-fidelity offset printing method firstly forms CXF files 10 corresponding to all pantone special colors, then obtains a source target spectrum database consisting of spectral data of all pantone special colors through scanning of a spectrometer, utilizes the CXF files 10 of the seven primary colors to generate seven-primary color Gamut tables shown in figures 2, 3 and 4 in CGS ORIS X Gamma software, then prints the seven-primary color Gamut tables by offset printing equipment, obtains a high-fidelity characteristic file corresponding to a sample sheet of the seven-primary color Gamut tables through scanning of the spectrometer, establishes a matching relationship between the high-fidelity characteristic file and the source target spectrum database to obtain a conversion curve required by converting color blocks in the sample sheet of the seven-primary color Gamut tables into corresponding pantone special colors and form a conversion curve database, and obtains a conversion curve required by converting the color blocks in the sample sheet of the seven-primary color Gamut tables into target colors according to the target colors of printed products, the method combines the conversion relation between the color blocks and the seven primary colors in the high-fidelity characteristic file to obtain the preparation proportion and the preparation logic of the target color mixed by the seven primary colors, further realizes that the target color containing different pantone special colors can be offset by only utilizing the seven primary colors, avoids the need of configuring the special colors before each printing, greatly improves the printing efficiency, and can ensure the color uniformity of output products.
As some preferred embodiments of the present invention, step h is followed by step i, and step i comprises: the method comprises the steps of manufacturing a zinc plate, preparing ink, paper and auxiliary materials, adjusting overprinting precision and overprinting ink color, and performing trial printing and formal printing. Wherein, the zinc plate making part comprises typesetting and makeup of image-text information; the trial printing is used for confirming whether the deviation between the color of the printed matter and the target color exceeds the precision requirement, so that the waste of printing materials can be avoided; and d, preparing the ink according to the preparation proportion and the preparation logic of the target color prepared by mixing the seven primary colors obtained in the step h.
In some embodiments of the present invention, step i is followed by step j: and cutting the printed finished product, and packaging the cut printed finished product, thereby realizing the integrated production of the offset printing product.
The above examples are merely preferred embodiments of the present invention, and other embodiments of the present invention are possible, such as a reasonable combination of the technical solutions described in the examples. Those skilled in the art can make equivalent changes or substitutions without departing from the spirit of the present invention, and such equivalent changes or substitutions are included in the scope set forth in the claims of the present application.

Claims (4)

1. A high fidelity offset printing method based on seven primary colors is characterized by comprising the following steps:
a. preparing spot color ink, and preparing corresponding spot color ink according to the formula of each Pantong spot color;
b. generating a CXF file (10) corresponding to each pantone special color, printing the special color ink obtained in the step a into a color gradient table (11) corresponding to the special color ink and an overlapped gradient table (12) formed by overlapping the color gradient table (11) and black stripes by using offset printing equipment, and forming the CXF file (10) corresponding to the pantone special color by using the overlapped gradient table (12) and the color gradient table (11);
c. forming a source target spectrum database, scanning the CXF files (10) corresponding to all the pantone special colors in sequence by using a spectrometer to obtain spectral data corresponding to all the pantone special colors, and forming the source target spectrum database by the spectral data of all the pantone special colors;
d. generating a seven-primary-color Gamut table, extracting CXF files (10) corresponding to Cyan, Magenta, Yellow, Black, Orange, Green and Blue in the step b, inputting the CXF files (10) of the seven primary colors into CGS ORIS X Gamut software, and forming the seven-primary-color Gamut table by randomly combining color blocks in the CXF files (10) corresponding to the seven primary colors, wherein the seven-primary-color Gamut table covers all pantone special colors in the step b, and then outputting the seven-primary-color Gamut table as an electronic file;
e. printing a seven-primary color gamut table sample sheet, inputting an electronic file of the seven-primary color gamut table into offset printing equipment, and printing the seven-primary color gamut table sample sheet of the offset printing plate;
f. generating a high-fidelity characteristic file, and scanning the seven-primary color gamut table sample by using a spectrometer to obtain spectral data corresponding to each color block in the seven-primary color gamut table sample, wherein the spectral data corresponding to all the color blocks in the seven-primary color gamut table sample form the high-fidelity characteristic file together;
g. establishing a conversion curve library, using CGS ORIS X Gamut software to match the high-fidelity characteristic file with a source target spectrum database, so that a conversion relation is established between any pantone special color in the source target spectrum database and at least one color block in the high-fidelity characteristic file, further obtaining conversion curves required by converting each color block in the high-fidelity characteristic file into corresponding pantone special color, and forming the conversion curve library by all the conversion curves;
h. and printing a product, scanning by using a spectrometer to obtain spectral data of a target color to be printed, comparing the spectral data of the target color with the high-fidelity characteristic file to obtain more than one conversion curve in the conversion curve library, and combining a conversion relation between a color block in the high-fidelity characteristic file and seven primary colors to obtain a preparation proportion and a preparation logic of the target color by mixing the seven primary colors.
2. The high fidelity offset printing method based on seven primary colors according to claim 1, characterized in that:
the seven-primary color gamut table comprises 2116 color blocks, and the 2116 color blocks comprise 1876 pantone special colors.
3. The high fidelity offset printing method based on seven primary colors according to claim 1, characterized in that:
step h is followed by step i, wherein step i comprises: the method comprises the steps of manufacturing a zinc plate, preparing ink, paper and auxiliary materials, adjusting overprinting precision and overprinting ink color, and performing trial printing and formal printing.
4. The seven-primary-color-based high-fidelity offset printing method according to claim 3, characterized in that:
the step i is followed by the step j: and cutting the printed finished product, and packaging the cut printed finished product.
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