Patent ID: 7289663

Claim:
A method for producing an extended color gamut luminance-chrominance digital image from sensor color exposure values for a captured digital image comprising: a) using a color image sensor to provide sensor color exposure values for an original scene; b) determining intermediate extended gamut scene RGB image values for the captured digital image from the sensor color exposure values by representing the scene colors in terms of a first set of extended gamut RGB primaries; c) determining intermediate extended gamut rendered RGB image values by applying a rendering transformation to the intermediate extended gamut scene RGB image values, wherein the extended gamut rendered RGB image values are a representation of the colors of a rendered image in terms of the first set of extended gamut RGB primaries; d) determining extended range output RGB image values from the intermediate extended gamut rendered RGB image values by transforming from the first set of extended gamut RGB primaries to a second set of RGB primaries associated with an output image display device to produce extended range output RGB image values, wherein the extended range output RGB image values include values outside the range that can be displayed on the output image display device; and e) producing an extended color gamut luminance-chrominance digital image by transforming the extended range output RGB image values to a luminance-chrominance representation.