Patent ID: 7162079

Claim:
A color conversion definition correcting method of correcting a color conversion definition consisting of a combination of a target profile representative of an association between coordinates on a target color space depending on a target device for outputting an image based on image data and coordinates on a colorimetric color space of a device non-dependence with an output profile representative of an association between coordinates on an output device color space depending on an output device for outputting an image based on image data and coordinates on the colorimetric color space, said color conversion definition correcting method comprising: a target profile correcting step of applying to said target profile such a correction that coordinate values out of a color gamut for said output device in the colorimetric color space, of coordinate values in a color gamut for said target device in the colorimetric color space, all go in the color gamut for said output device; a first colorimetric step of measuring color patches of a color chart outputted from said target device in accordance with first chart data representative of a color chart in which a plurality of color patches is arranged to obtain first colorimetric data defined by the coordinates on said colorimetric color space; a second colorimetric step of measuring color patches of a color chart outputted from said output device in accordance with second chart data in which the first chart data is converted in accordance with said color conversion definition to obtain second colorimetric data defined by the coordinates on said colorimetric color space; a colorimetric data correcting step of applying same correction as the correction in said target profile correcting step to the first colorimetric data obtained in said first colorimetric step; and a definition correcting step of further correcting the color conversion definition in which the target profile is corrected in said target profile correcting step, in accordance with the first colorimetric data corrected in said first colorimetric data correcting step and the second colorimetric data obtained in said second colorimetric step.