Patent ID: 7864371

Claim:
An image processing apparatus that converts an input color signal to a color signal reproducible by an output device, the apparatus comprising: a storage unit that stores therein a target reproduction color for a standard color reproduction range corresponding to average size and shape of a plurality of color reproduction ranges of a plurality of output devices; a converting unit that converts, by referring to the storage unit, an input color signal to a color signal reproducible by the output devices; a gamut processing unit that performs gamut processing for converting the input color signal to a color signal within the color reproduction ranges of the output devices; a calculating unit that calculates a deviation between the target reproduction color and a reproduced color obtained from the gamut processing; and a correcting unit that corrects a mapping parameter used in the gamut processing so that the deviation falls within an allowable range, wherein the calculating unit calculates the deviation by a color difference formula giving a negative value when the reproduced color obtained from the gamut processing has a higher chroma than the target reproduction color, and the correcting unit corrects the mapping parameter by optimizing a chroma compression parameter after optimizing a hue correction parameter.