Patent ID: 7365755
Filing Date: 2008-04-29
Classification: H04N

Abstract:
1. A method for gamut mapping between a source device and a destination device, the destination device having a destination device black point with a hue, and the source device and the destination device being respectively characterized by a source gamut shell and a destination gamut shell, the method comprising the steps of: performing a lightness compression using the source gamut shell, the destination gamut shell and the destination device black point, performing a constant lightness transformation, wherein the constant lightness transformation modifies the destination gamut shell so that a shell boundary of the destination gamut shell on the hue plane containing the destination device black point is shifted from an original position to align with a neutral axis of the destination gamut shell; performing a chroma compression using the source gamut shell and the modified destination gamut shell; and performing an inverse constant lightness transformation to obtain mapped colors for the destination device, wherein the inverse constant lightness transformation returns the shell boundary to the original position.