The Optimization Technology Of Color Gamut Mapping For Color Printing

Color gamut mapping is a key technology to improve the color reproduction ability of devices. Because there are some problems in gamut mapping technology, such as: the CIE L*A*B* is not a perceptually uniform color space, the knowledge of custom colors is not sufficient, and how to select the anchor point is very important, we propose some ideas to solve these problems. On the basis of getting the gamut shells and gamut sections, an adaptive compression mapping method is designed and realized. The method's anchor point is selected according to the maximum chroma point of printer gamut, so the mapping distortion could be decreased to some extent in the maximum distortion subregions. A new mapping method, which is based on the geometric characteristics of the gamut of monitor and printer, is also presented. The method improves the accuracy of the color reproduction and reduces the consuming time. The method preserving flesh tone contents is mended. The flesh tone subregion is processed with changing kernel of gamut, so the mended method improves the reproduction quality of flesh tone content. To validate the new methods, the way of observing appearance of color images and color difference formulae are used to compare the new methods with present methods.