A Method of Ink Color Matching Based on Spectral Matching

Abstract

The invention relates to a printing ink color matching method based on spectral matching. The printing ink color matching method aims to achieve the optimal spectral matching of printing ink colors. The Lab color values of splines of a database and the spectral reflectivity of visible spectrums of the splines are measured and obtained; the corresponding relation of the spectral reflectivity of the visible spectrums, the Lab color values and a formula and each spline is built; the Lab value of target colors and the spectral reflectivity of visible spectrums of the target colors are measured; data points are extracted from the database according to the Lab color values of the target colors, wherein the color difference between the data points and the target colors is 0-5; the spectral reflectivity of each extracted data point in the database is regulated, and the mean value of the spectral reflectivity of samples is made to correspond to the mean value of the spectral reflectivity of the target colors; the spectrum difference index of each data point and the target colors is calculated and extracted; the point with the smallest difference index is found out from the extracted data points, and the optimal printing ink formula of the target colors is given according to the printing ink formula, corresponding to the point, in the database.

Description

technical field [0001] The invention relates to the technical field of printing, in particular to an ink color matching method based on spectral matching. Background technique [0002] The current computer color matching method is based on mixing and matching experiments of more than a dozen commonly used basic color inks in different proportions, making a sample of the mixed ink, and then measuring the Lab chromaticity value of the sample sample, and matching it with its color. The ink formula associated with the establishment of a huge database. In ink color matching, the given formula is based on the Lab color value of the target color, and the corresponding color value is searched in the database to find out the similar color value in the database, and then interpolated to give the corresponding formula; In addition, the current ink color matching software adopts the Lab chroma value matching method, which can achieve the consistency of color vision, but this matching m...

AI Technical Summary

Problems solved by technology

In ink color matching, the given formula is based on the Lab color value of the target color, and the corresponding color value is searched in the database to find out the similar color value in the database, and then interpolated to give the corresponding formula; In addition, the current ink color matching software adopts the Lab chroma value matching method, which can achieve the consistency of color vision, but this matching method does not take into account the color metamerism, and the visual color consistency is based on specific lighting The spectral power distribution of the light source is observed in the environment. When the spectral power distribution of the lighting source changes, it is easy to produce visual color deviation, which affects the color matching effect of the software.

Images