NUMERICALLY ROBUST IMPLEMENTATION OF SPECTRAL GAMUT MAPPING

摘要

Color management in which gamut mapping is performed in a spectral color space. The gamut mapping process includes a calorimetric gamut mapping step, in which a calorimetric projection of the source-side color is gamut-mapped into a calorimetric projection of the destination side's spectral gamut. To ensure that the resulting gamut-mapped calorimetric color can be inverted into a set of feasible points in the spectral gamut, an additional step is inserted into the gamut-mapping process. Specifically, a further projection is made of the gamut-mapped calorimetric projection, whereby the calorimetric color is projected onto within the numerical boundary of the calorimetric projection of the destination side's spectral gamut. This additional projection yields a numerically robust color space color, that largely avoids adverse effects that otherwise might be caused by “numerical voids” found in the floating point representation of numbers by digital computers.