Patent ID: 7103216

Claim:
A color chart, for creating a color conversion definition for converting first color data representative of coordinate points in a first color space depending on an input device for entering image to obtain image data into second color data representative of coordinate points in a second color space independent of devices, in which a plurality of color patches different in color is arranged, said color chart comprising: color patches associated with all vertexes of a rectangular parallelepiped defined by a base coloring value (QC b , QM b , QY b ) comprising: combinations of minimum coloring values QC b , QM b and QY b of monochromes of cyan, magenta and yellow in a coloring value space represented by three axes of coloring values of cyan, magenta and yellow, a maximum coloring value QC max of monochrome of cyan, a maximum coloring value QC max of monochrome of magenta M, and a maximum coloring value QY max of monochrome of yellow Y in the coloring value space and; a color patch associated with an intermediate point located between two vertexes on a straight line coupling the two vertexes with one another, even if any two vertexes of the rectangular parallelepiped are selected.