Patent ID: 6061501
Filing Date: 2000-05-09
Classification: B41B,G06K,H04N

Abstract:
A method for converting an externally defined four dimensional colorant (CMYK) into an equivalent four dimensional colorant (C'M'Y'K') having color components of a given printer, the method comprising:transforming three components (CMY) of the externally defined four dimensional colorant (CMYK) into an equivalent combination of three colorants (C'M'Y') based upon measured L*a*b* values of varying combinations of the three colorants printed out by the printer;transforming a fourth component (K') of the externally defined four dimensional colorant (CMYK) into an equivalent fourth component (K') of the given printer based upon measured L* values of varying percentages of a fourth colorant printed out by the printer; andcombining the equivalent combination of three colorants C'M'Y' with the equivalent fourth component K' to form the equivalent four dimensional colorant (C'M'Y'K') having color components of the given printer wherein L*a*b* of (CMY) is closely matched with L*a*b* of (C'M'Y') and K of (CMYK) is closely matched with K' of (C'M'Y'K').