Patent ID: 6775028
Filing Date: 2004-08-10
Classification: H04N

Abstract:
A method of mapping an input color gamut of an input device onto an output color gamut of an output device, comprising the steps of:establishing a threshold chroma value in the input color gamut; for first input chroma values below said threshold chroma value: mapping each said first input chroma value onto a respective one of a plurality of first output chroma values such that a first linear relationship exists between said first input chroma values and said first output chroma values; and mapping each corresponding first input lightness value onto a respective one of a plurality of first output lightness values such that a second linear relationship exists between said first input lightness values and said first output lightness values; and for second input chroma values above said threshold chroma value: mapping each said second input chroma value onto a respective one of a plurality of second output chroma values such that a first non-linear relationship exists between said second input chroma values and said second output chroma values; and mapping each corresponding second input lightness value onto a respective one of a plurality of second output lightness values such that a second non-linear relationship exists between said second input lightness values and said second output lightness values.