Color reproduction data converting method

摘要

The improved color reproduction data conversion method of the present invention comprises the steps of obtaining the color matching ink amounts of CMY colors being metamer with the calorimetric data as to a plurality of different amounts of K-plate; obtaining an achromatic amount from a total ink amount of CMYK for each amount of the K plate; obtaining an achromatic amount function for the amount of the K plate in the linear portion; generating a mapping function from the calorimetric data and the achromatic amount to the ink amounts of CMYK in the linear portion and obtaining a weighting coefficient for reflecting to the achromatic amount with the K plate control condition previously selected; determining the achromatic amount from the colorimetric data; and calculating ink amounts of CMYK from the achromatic amount and the calorimetric data with the use of the mapping function of the CMYK ink amount. As a result, the invention method can obtain reproducible four-dimensional color reproduction data for actual printing from the three-dimensional colorimetric data while maintaining metamerism under a K plate generating condition set up arbitrarily by the user.