Patent ID: 8134574

Claim:
A conversion table creating device for creating a color conversion table for converting first color data defined in a first color space to second color data defined in a second color space, comprising: a processor configured to execute program instruction stored on a storage device, the program instructions providing: a first dividing unit that divides a second color space into a plurality of polyhedron spaces, each being defined by a plurality of first vertices, each of the plurality of first vertices being defined by a plurality of sets of third color data that are defined in the second color space; a color data setting unit that sets a plurality of sets of fourth color data that are defined in a first color space in one to one correspondence with the plurality of third color data sets; a division number setting unit that sets a division number for dividing each of the plurality of polyhedron spaces into the plurality of smaller polyhedron spaces, the division number setting unit setting the division number for one polyhedron space independently from other polyhedron spaces; a second dividing unit that divides each of the plurality of polyhedron spaces into a plurality of smaller polyhedron spaces by the division number set for the each polyhedron space, each being defined by a plurality of second vertices and the plurality of first vertices, each of the plurality of second vertices being defined by a plurality of sets of fifth color data defined in the second color space; an interpolation calculation unit that calculates a plurality of sets of sixth color data that are defined in the first color space in one to one correspondence with the plurality of second vertices by interpolating the plurality of the fourth color data sets; and a conversion table creating unit that creates a conversion table based on the fourth color data sets and the sixth color data sets and on the third color data sets and the fifth color data sets; wherein the division number setting unit sets, for each polyhedron space, the division number based on a color difference between the plurality of the fourth color data sets that are set on the plurality of first vertices that define the each polyhedron space; wherein the second color space is defined by a plurality of axes, and wherein the division number setting unit sets the division numbers for the respective axes, independently from one another.