Inventors:
William Chesley Decker - Longmont CO
Ho Chong Lee - Boulder CO
Jack Louis Zable - Niwot CO
Assignee:
International Business Machines Corporation - Armonk NY
International Classification:
B41B 1900
G03F 308
H04N 146
G06K 900
Abstract:
Disclosed is a method, system, and program for converting an externally defined four dimensional colorant, e. g. , CMYK, to an equivalent four dimensional colorant, e. g. , C'M'Y'K, having components of a printer. A measurement is made of first color values, e. g. , L. sup. * a. sup. * b, of a first set of patches having predetermined combinations of varying percentages of three primary colors, e. g. , CMY, printed by the printer. Each combination of known CMY values are correlated with corresponding color values, e. g. , L. sup. * a. sup. * b, as input to a first inversion program for determining CMY values for any given color value (L. sup. * a. sup. * b). A measurement is also made of second color values, e. g. , L. sup. * a. sup. * b, of a second set of patches having predetermined varying percentages of a fourth colorant (K) printed by the printer. The first inversion program is used to determine CMY values corresponding to the color values, L. sup. * a. sup.