A printing spot color matching method based on absorption spectrum

Abstract

The invention discloses an absorption spectrum-based special printing color matching method. The method specifically comprises the following steps: calibrating primary color ink on a printing base, and obtaining n types of base color ink for color matching; then printing the n types of base color ink on a black-white printing material, and respectively measuring the spectral reflectivity of the black-white printing material and the spectral reflectivities of on-site color pieces of the n types of base color ink under the black-white printing base, thus obtaining 2n+2 groups of spectral reflectivities; calculating the spectral reflectivities and the spectral transmissivities of the n types of base color ink by using the obtained spectral reflectivities; and building a color matching model of the spectral reflectivity of the base color ink and the spectral reflectivity of a target special color, thus obtaining optimal ratios of all types of primary color ink for color matching. Accordingto the absorption spectrum-based special printing color matching method, by the use of reflection spectrums to calculate absorption spectrums, color matching of special-color ink for intaglio printing is carried out through a computer. By the method, the influence of difference of the primary color ink on a color matching hue is reduced; and the color matching color range is expanded, the color matching time is shortened, and the color matching precision is effectively guaranteed.

Description

technical field [0001] The invention belongs to the technical field of printing and color matching, and relates to a printing spot color matching method based on absorption spectrum. Background technique [0002] The color reproduction of printed matter is usually achieved by register printing, that is, after the original is color-separated, the cyan yellow-black (CMYK) monochrome printing plates with different screen lines are used to overlap and print in sequence according to the color sequence of the printing plates, so as to obtain the same level and tone as the original. of prints. Spot color printing is different from register printing. It prepares the colors to be printed before printing, and then directly prints graphic information with a single plate. Spot color printing is a commonly used printing method in gravure printing, which can meet the requirements of gravure printing for color saturation and color accuracy. Spot color printing mostly uses large solid col...

AI Technical Summary

Problems solved by technology

Color matching personnel are required to deploy spot color inks based on their experience. Subjective factors have a great influence, the color matching ratio is not accurate enough, the color difference between different batches of the same color is large, the deployment time is long, and material waste is large.

Images