A high-fidelity offset printing method based on seven primary colors

Abstract

The invention discloses a high-fidelity offset printing method based on seven primary colors. The method includes the following steps: a. preparing spot color ink; b. generating a CXF file corresponding to each Pantone spot color; c. forming a source-target spectral database; d. Generate seven-primary color gamut table; e. Print sample sheets of seven-primary color gamut table; f. Generate high-fidelity characteristic files; g. Establish conversion curve library; h. Print products. The method obtains the conversion curve required to convert the color patch in the seven-primary color gamut table sample to the target color according to the target color of the printed product, and combines the conversion relationship between the color patch in the high-fidelity characteristic file and the seven primary colors, so as to obtain The preparation ratio and preparation logic of the target color can be obtained by mixing the seven primary colors, so as to realize the offset printing of the target color including different Pantone spot colors by using only the seven primary colors, avoiding the need to configure the spot color before each printing, and greatly reducing the The printing efficiency is improved, and the color uniformity of the output product can be guaranteed.

Description

technical field [0001] The invention relates to a high-fidelity offset printing method based on seven primary colors. Background technique [0002] Pantone (Pantone) color card is an internationally accepted standard color card and is a world-renowned color authority. It covers color communication systems in printing, textiles, plastics, graphics, digital technology and other fields, and has become an international unified standard for exchanging color information today. language. [0003] The Pantone color card has 1876 spot colors, and each spot color is made by mixing at least one base ink. In printing production, the color required for the printed matter may contain multiple spot colors. Before offset printing, the printed matter needs to be included All the spot colors are modulated, and then printed by offset printing equipment, resulting in a very large proportion of time and workload for the pre-printing work, which seriously affects the efficiency of product printi...

AI Technical Summary

Problems solved by technology

[0003] The Pantone color card has 1876 spot colors, and each spot color is made by mixing at least one base ink. In printing production, the color required for the printed matter may contain multiple spot colors. Before offset printing, the printed matter needs to be included All the spot colors are modulated, and then printed by offset printing equipment, resulting in a very large proportion of time and workload for the pre-printing work, which seriously affects the efficiency of product printing. For printed products with a small amount of printing , the cost of printing is very high, and it is impossible to guarantee the uniformity of the color matching effect of different batches of printed matter

[0004] Moreover, the color blocks on each Pantone color card are solid color blocks (that is, color blocks with a color gradient of 100%), and in the process of printing production, it is often necessary to use color blocks with a color gradient between 0 and 100%. The color blocks are mixed, which increases the workload of the workers, which is not conducive to mass production

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