A one-dimensional LUT has been incapable of
color matching. A three-dimensional LUT has been incapable of ensuring a color conversion accuracy enough to reproduce fine changes in
color tone on a
monochrome image. It has been impossible to suppress a storage capacity for a color conversion table by ensuring the accuracy. There is provided a color conversion table which has a plurality of pieces of reference
color image data making correspondence between
color data for a first image device and
color data for a second image device and comprises a specified total information amount. The color conversion table is used to distribute the reference
color image data over a prescribed area in a specified
color space.
Color data information for each reference
color image data is increased more than a specified amount within a limit of the specified total information amount. Further, a color conversion table is created using an original table which highly accurately defines colors in part of the color conversion table. If these color conversion tables are referenced for color conversion, it is possible to suppress the storage capacity, provide
color matching, and perform high accuracy color conversion.