Patent ID: 7154636
Filing Date: 2006-12-26
Classification: H04N

Abstract:
1. A color management method for converting internal color values to CMYK color values, wherein the method utilizes a color transform that maps CMYK color values to internal color values, the color transform being ranged as a plurality of three-dimensional CMY space to internal color space lookup tables, each associated with a different K value, the method comprising the steps of: receiving a target internal color value; calculating a relative purity of the target internal color value in CMY space; calculating a black generation value from the relative purity; selecting one of the plurality of CMY lookup tables based on the black generation value; and providing a CMYK value based on interpolation from the selected lookup table, wherein relative purity of the target internal color value is calculated based on a difference between a largest value and a smallest value of C, M and Y values for the target internal color value, relative to the largest value of the C, M and Y values for the target internal color value.