Study On Theory And Practice Of Computer Matching Color

This purpose of this paper is to save the time and reduce the cost of matching color of ink, improve the efficiency of matching color, fasten the data and standardization course of pre-print. The matching color by computer is full of importance which can reduce the work intensity greatly, make matching color easier and faster and more precise, guarantee the exact replicate of manuscript. The ink matching color by computer using three-dimensioned look up table and tetrahedron interpolation can reduce manufacture cost and improve corporation' s economy benefit, which is of academic and practical significance for promoting the development of science and technology in print industry.The study methods are adopted in this paper. According to the basic theories of the matching color by computer, three-dimensioned look up table is supplied in the ink matching color system of tri-stimulus values by XYZ space which is independent of equipment and by the theory that the colors are same which aren' t of the same spectrum. Then the arithmetic of tetrahedron interpolation is designed by the asymmetry trait of XYZ space and by the theory of invariability of form and structure in tetrahedron interpolation.The two experiments are made to check the precision by the color-base on the base of the chromatogram and the method of samples. At the same time, the color out of the gamut is dealt with by the method of saturation compressed on the basisof the theory of compression of the gamut. The experiment datas are dealt with by the methods of statistics and compare.The works finished in the paper are as follows. This paper firstly discusses the character of XYZ and CMY color spaces, and analyzes thetransformation relation between tri~stimulus values and ink percentage. Second, the color-base is built and the ink matching color model is made by three-dimensioned look up table and tetrahedron interpolation. Third, the Neugeaur equation is applied into the judgement of thecolor out of the gamut,and the disposal model of the color out of t he gamut is built, in which the method of saturation compressd is use d. Forth, the application software is developed. Fifth, the accuracy of the method of matching color is checkd by experiment. At last, the fact ors which influnce the matching color are analyzed.There are four conclusions in the paper. It is to save the time and to improve the efficiency in three-dimensioned look up table. It is more precise and easier for tetrahedron interpolation which is of the simple theory. The analysis show that the method of saturation compressed that is supplied in the color out of the gamut is of good feasibility. The software of matching color is easier to operate and is more precise than trational matching color, which helps to the management of data and standard,...