Patent ID: 8233098

Claim:
A system ( 600 ) for performing at least one of gamut compression and gamut extension by: transforming an input color ( 608 ) of an input image defined within a first gamut ( 102 ) into a reproduction color ( 610 ) of an output image for rendering by a reproduction device capable of rendering colors within a second gamut ( 104 ) different from the first gamut, the input color having an input chromaticity (C i ) and an input lightness (L i *) together forming an input point ( 202 ) in a chromaticity-lightness plane, the reproduction color having a reproduction chromaticity and a reproduction lightness together forming a reproduction point ( 210 ) in the chromaticity-lightness plane, wherein an absolute difference between the input lightness and the output lightness is a decreasing function of at least the chromaticity, and an absolute difference between the input chromaticity and the output chromaticity is an increasing function of at least the chromaticity, wherein an angle (θ) between a positive chromaticity axis of the chromaticity-lightness plane and a line connecting the input point and the reproduction point is a continuous function of at least the input chromaticity.