Patent ID: 6943915

Claim:
A color conversion method of converting printing image data, which comprises process color image data defined by a coordinate value of a predetermined first color space, and spot color image data defined by a coordinate value of a characteristic direction, into image data defined by a coordinate value of a predetermined second color space, for a proofer for outputting a proof image in which an image obtained through printing of an image based on the printing image data in accordance with a predetermined printing condition is reproduced, said color conversion method comprising: a printing condition conversion step associated with a printing condition, of converting the coordinate value of the first color space into coordinate values of a colorimetry color space which is device-nondependent; a spot color reference step of converting a spot color name into the coordinate values of the colorimetry color space; a proof condition conversion step associated with a proof condition, of converting the coordinate values of the colorimetry color space into coordinate values of the second color space; and a composition step of synthesizing, on the colorimetry color space or the second color space, image data defined by coordinate values of the colorimetry color space or the second color space, wherein the process color image data is converted, with image data defined by coordinate values of the colorimetry color space or the second color space, wherein the spot color name is converted; wherein the printing image data, which comprises the process color image data defined by the coordinate value of the first color space, and the spot color image data defined by the coordinate value of the characteristic direction, is converted into the image data defined by the coordinate value of the second color space, for the proofer.