Seven-color separation method for colored images

Abstract

The invention relates to a seven-color separation method for colored images, which can effectively solve the problem of the prior art that: the fine detail of the reproduced color is lost, and the color is not vivid enough. In the technical scheme of the invention, a non-CMYK (cyan, magenta, yellow and key) color mode digital image original is converted into a Lab color mode by way of color spaceconversion, a seven-color separation algorithm is utilized to separate the digital image in the Lab color mode into seven color channels (cyan, magenta, yellow, black, red, green and blue channels) by means of a computer and specific software, the seven channels of colors are superposed in the specific software, so that the reproduced color of the color-superposed original is displayed, and the accuracy of the generated reproduced color is consistent with the accuracy of the color of the original. The seven-color separation method can remarkably increase the quality of printing reproduction, the lays of graphics of the fine detail of the reproduced color are rich, the color is vivid, and moreover, the seven-color separation method can remarkably increase the precision of reproductions, and is applicable to the reproduction of fine prints.

Description

technical field [0001] The invention relates to a computer graphic image processing method, in particular to a color separation method for a color image, in particular to a seven-color separation method for a color image. Background technique [0002] With the development of economy and society, people have higher and higher requirements for the quality of printed matter. However, the existing cyan, magenta, yellow and black four-color reproduction technology can display a very small color gamut, only about half of the visible spectrum, and the printed spectral curve has a large gap with the original, while the secondary and tertiary colors The difference between the overlapping color effect and the ideal spectral curve is more obvious, especially in the red, green, and blue areas, the reproduced color saturation is low, and the color original cannot be accurately reproduced. The color gamut of four-color reproduction can be significantly expanded by adding additional prima...

AI Technical Summary

Problems solved by technology

However, this method does not form a general ICC color description file (a general color description file formulated by the International Commission on Illumination), and its popularization and applicability is low; it does not deal with dual colors, and the subtle layering of the reproduced color is not obvious; and The color separation algorithm used is the Neusselberger equation method, which has low precision and unsatisfactory effect

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