Patent ID: 7880942

Claim:
A method for converting color coefficients between color spaces, comprising: using a computer to perform: receiving a color profile comprising a lookup table which defines a conversion of color coefficients between a source color space and a destination color space, wherein the source color space comprises a CMYK color space and includes a black color channel, and wherein the destination color space comprises a non-CMYK color space; identifying a darkest output color value in the destination color space produced by the color profile, wherein the darkest output color value includes a chromatic component; identifying entries in the lookup table corresponding to a maximum possible value for the black color channel of the source color space, wherein each of the identified entries comprises a respective mapping from a respective source color in the source color space to a respective destination color in the destination color space; and updating the identified entries to map each respective source color having the maximum possible value for the black color channel to an updated destination color having an achromatic equivalent of the identified darkest output color value, wherein the updated destination color is represented as a color in the destination color space.