Conversion table creating device, storage medium storing conversion table creating program, and conversion table creating method

A computer readable storage device storing a computer-executable conversion table creating program for a conversion table creating device, the conversion table creating device 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, the conversion table creating program comprising:

• instructions for dividing a second color space into a plurality of polyhedron spaces, each being defined by a plurality of first vertices and a plurality of axes, 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;
• instructions for setting 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;
• instructions for setting a division number for dividing each of the plurality of polyhedron spaces into the plurality of smaller polyhedron spaces, and for setting the division number for one polyhedron space independently from other polyhedron spaces;
• instructions for dividing 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;
• instructions for calculating 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
• instructions for creating 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;
• instructions, for each polyhedron space, setting 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;
• and
• instructions for setting the division numbers for the respective axes independently from one another.

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 and by a plurality of edges, 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, the division number setting unit setting, 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, the division number setting unit setting the division numbers for the respective edges, independently from one another;
• 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.

A computer readable storage device storing a computer-executable conversion table creating program for a conversion table creating device, the conversion table creating device 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, the conversion table creating program comprising:

• instructions for dividing a second color space into a plurality of polyhedron spaces, each being defined by a plurality of first vertices and a plurality of edges, 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;
• instructions for setting 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;
• instructions for setting a division number for dividing each of the plurality of polyhedron spaces into the plurality of smaller polyhedron spaces, for setting the division number for one polyhedron space independently from other polyhedron spaces, for each polyhedron space, setting 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, and for setting the division numbers for the respective edges independently from one another;
• instructions for dividing 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;
• instructions for calculating 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
• instructions for creating 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.