COLOR GAMUT MAPPING BASED ON THE MAPPING OF CUSP COLORS OBTAINED THROUGH SIMPLIFIED CUSP LINES

摘要

For the mapping in a non-linear color space of source colors belonging to a same constant-hue leaf, a lightness mapping function can be used which is based on a cusp lightness condition stating that a source cusp color of this leaf should be mapped into a corresponding target cusp color of this leaf. Source and target cusp colors are determined by the intersection of a source and target cusp lines with this leaf. The invention describes a method providing simplified source and target cusp lines based on a convex hull algorithm which are used instead to determine modified source and target cusp colors for the definition of the lightness mapping function.