Patent ID: 7148900

Claim:
A CCM calculating system for calculating a blending ratio of colorants based on stored color data including data of color chips and data of colorants, and for presenting information of said blending ratio to a user, said system comprising: a data receiving means for receiving data identifying a color chip selected by a user and data of differences of color specification values between color specification values corresponding to the selected color chip and color specification values corresponding to a desired target color; a calculating means for calculating a target blending ratio of colorants for reproducing said desired target color based on said data of colorants and data of said color specification values corresponding to said desired target color; and a means for supplying data of said calculated target blending ratio to be presented to a user; wherein said differences color specification values are specified by a user based on an image in a display and a visual perception of a color of said selected color chip and said desired target color.