Importance

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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.* b, for the varying percentages of the fourth colorant (D). These determined CMY values corresponding to the second set of patches (D) and the known CMY values of the first set of patches are used to determine an equivalent fourth colorant substitution for the first patches having new CMY (C'M'Y') values and a corresponding percentage of the fourth colorant (D). Each combination of the C'M'Y' and K are correlated with associated color values as input to a second inversion program for determining C'M'Y'K values for any given color values or equivalent values.

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