Patent ID: 7453602

Claim:
A color conversion method for converting a color signal for an image output device into a color signal in a color space for color matching, comprising: an acquisition step of acquiring a color signal A of an image output device; a determination step of determining whether the color signal A is contained inside a low-saturation area on the color space containing a color signal P of gray for the image output device at a lightness of the color signal A and a color signal O that is colorimetrically achromatic color; a conversion step of converting the color signal A into a color signal D in accordance with a conversion function of converting the color signal on a line segment BP connecting a color signal B that is an intersection between a line segment connecting the color signal A and the color signal P and the outermost contour of the low saturation area and the color signal P into the color signal on a line segment BO connecting the color signal B and the color signal O, when the color signal A is contained in the low-saturation area in said determination step, wherein when the color signal A is not contained in the low-saturation area, the color signal is not converted in said conversion step.