Patent ID: 6865292

Claim:
A color conversion method of 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 method comprising the steps of: (a) calculating a minimum value α and a maximum value β of said first set of three color data for each pixel; (b) 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 obtained at said step (a); (c) generating first comparison-result data based on the hue data obtained at said step (b); (d) for generating second comparison-result data based on said first comparison-result data; (e) performing calculation using the hue data obtained at said step (b) to produce calculation result data; (f) generating specified matrix coefficients for the hue data, the calculation result data, the first comparison-result data and the second comparison-result data; and (g) calculating, 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 generating means, said second set of three color data, said step (g) comprising the step of performing matrix calculation on at least said hue data, said first comparison-result data, said second comparison-result data, said calculation result data, and the coefficients obtained at said step (f).