Determination of chroma mapping functions based on hue angle sectors partitioning region mapping color space

摘要

This determination may include defining key constant-hue leaves to partition the region-mapping color space into angle tone sectors; Defining, for each key calendar tint leaf, a key tinted leaf chroma mapping function; For any source color belonging to one of the two key calendar-tone leaves delimiting this angular tone sector, a continuous chroma mapping function is applied to the key color tint leaf chroma mapping function of the core calendar-hue leaf to which the source color belongs And for each angle tint sector to allow mapping of the chroma of the source color in accordance with the successive tint sector chroma mapping function. Preferably, these mapping functions are non-linear polynomials.