Patent ID: 6930809

Claim:
A color conversion device for performing pixel-by-pixel color conversion from a first set of three color data representing red, green and blue, or cyan, magenta and yellow, into a second set of three color data representing red, green and blue, or cyan, magenta, and yellow, said device comprising: first calculation means for calculating a minimum value α and a maximum value β of said first set of three color data for each pixel; hue data calculating means for calculating hue data r, g, b, y, m and c based on said first set of three color data, and said minimum and maximum values α and β outputted from said first calculation means; means for generating first comparison-result data based on the hue data outputted from said hue data calculating means; means for generating second comparison-result data based on said first comparison-result data; second calculation means for performing calculation using the hue data outputted from said hue data calculating means to produce calculation result data; coefficient storage means for storing matrix coefficients for the hue data, the calculation result data, the first comparison-result data and the second comparison-result data; coefficient setting means for setting specified coefficients in said coefficient storage means; and third calculation means responsive to said hue data, said first comparison-result data, said second comparison-result data, said calculation result data, and the coefficients from said coefficient storage means for calculating said second set of three color data representing red, green and blue, or cyan, magenta, and yellow, said third calculation means performing calculation including matrix calculation performed at least on said hue data, said first comparison-result data, said second comparison-result data, said calculation result data, and the coefficients from said coefficient storage means.