Patent ID: 6839150

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 calculating 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; coefficient generating means for generating specified matrix coefficients for the hue data, the first comparison result data and the second comparison-result data; second calculation means responsive to said hue data, said first comparison-result data, said second comparison-result data, and the coefficients from said coefficient generating means for calculating a third set of three color data representing reds, green and blue, or cyan, magenta and yellow; said second calculation means performing calculation including matrix calculation performed at least on said hue data, said first comparison-result data, said second comparison-result data, and the coefficients from said coefficient generating means; and gray scale conversion means for converting a gray scale of said third set of three color data, to produce said second set of three color data.