Abstract
In the color conversion processing for DTP printer, it was a subject to realize both of preservation of black separation and colorimetric color reproduction. This paper describes the color conversion method of 4 input and 4 output signals for realization both of preservation of black separation and colorimetric color reproduction, and the evaluation results of the color separation characteristic and accuracy in color conversion. The new color conversion algorithm is proposed in this paper, it consists of these 4 parts, (1)L*a*b* color signals transformation from input YMCK signals, (2)output black(K')signal transformation on equal lightness with input black(K)signal, (3)output Y'M'C' signals determination by L*a*b* color signals and K' signal, (4)Y'M'C' signals adjustment to zero when all YMC signals are zero. This algorithm could realize both of preservation of black separation and colorimetric color reproduction, and accuracy in color conversion has been much improved as compared with the conventional method, which guaranteed preservation of black separation.
