Patent ID: 7414631

Claim:
A method for gamut mapping from a source color in a device independent coordinate system to a destination color in the device independent coordinate system, wherein said method preserves a perceptual rendering intent, said method comprising: obtaining a gamut boundary descriptor (GBD) for each of the source and the destination, wherein both of the source GBD and the destination GBD each includes at least a first shell and a second shell which is mostly contained by the first shell; rescaling lightness of the source color to obtain a lightness of the destination color, wherein said lightness rescaling step defines a lightness mapping of the first shell of the source GBD to the first shell of the destination GBD, and of the second shell of the source GBD to the second shell of the destination GBD; and compressing chroma of the source color to obtain chroma of the destination color, wherein said chroma compression step defines a chroma mapping, of the first shell of the source GBD to the first shell of the destination GBD, and of the second shell of the source GBD to the second shell of the destination GBD.