Patent ID: 8274525
Filing Date: 2012-09-25
Classification: G09G,H04N

Abstract:
1. A color mapping method of mapping an input image signal into an output image signal for a display comprising display pixels having three or more sub-pixels with primary colors defining a display color gamut, the method comprises: using desirable luminances of reflective spectra of real world objects having different colors corresponding to different chromaticities within the display color gamut, wherein the reflective spectra are spectra of light reflected by respective ones of the real world objects, and wherein a desirable luminance is a total amount of light reflected by a corresponding one of the real world objects, gamut mapping the input image signal having input pixel colors defined by an input luminance and an input chromaticity to obtain a mapped image signal having corresponding mapped pixel colors defined by a mapped luminance and a mapped chromaticity, the input pixel colors lying within an input color gamut different from the display color gamut; and adapting the mapped luminance by using a factor being dependent on a difference between the desirable luminance and the mapped luminance to obtain an output luminance nearer to the desirable luminance than the mapped luminance, wherein the image output signal is defined by the mapped chromaticity and the output luminance.