Spot color ink amount and color determination method capable of minimizing color difference

Abstract

The invention discloses a spot color ink amount and color determination method capable of minimizing color difference. The method comprises the following steps: detecting XYZ values of the two color samples with different ink layer thicknesses, and establishing a linear relation function among the X value, the Y value, the Z value and the ink layer thicknesses of the color samples; establishing arelation function among the L * value, the a * value, the b * value and the ink layer thickness; establishing a relation function between the color difference between the color sample and the target color and the ink layer thickness, solving a minimum color difference value and the corresponding ink layer thickness within an ink layer thickness range allowed by a printing process, and when the minimum color difference value is smaller than or equal to an allowed value, taking the sum of the ink layer thickness and the chromatic value corresponding to the minimum color difference as an ink quantity reference and a color reference of a pass sheet to control printing production, otherwise, correcting a spot color formula. The problem that the color matching efficiency is low due to the fact that whether the ink color meets the target requirement or not is judged only according to the proofing color under the specific ink layer thickness condition is solved, the color matching requirementcan be quickly met by combination of adjusting of the ink layer thickness an adjusting of the formula, and the color matching efficiency is improved.

Description

technical field [0001] The invention belongs to the field of printing production, and in particular relates to a method for determining the amount and color of spot color ink that can minimize color difference Background technique [0002] In addition to color printing, lithographic printing also uses a large number of spot color ink printing, especially in the field of packaging printing. Customers generally provide color samples or specified chromaticity values ​​as the target color requirements, and give the allowable range of color difference. Printing companies use basic color inks, use computer color matching systems and manual experience to deploy spot color inks, and then use color development instruments to print colors. Sample, by detecting the color difference between the color sample and the target color requirements to determine whether the spot color meets the requirements. Accurately blending spot color inks is a relatively difficult task. Even with the assis...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention proposes a method for determining the amount and color of the spot color ink that can minimize the color difference. The method is aimed at a spot color ink formula, and only according to the proofing color under the condition of a specific ink layer thickness, Judging whether the ink color meets the target requirements, and then relying on adjusting the ink formula to correct the color, resulting in low color matching efficiency

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