Patent ID: 7864372

Claim:
A color conversion apparatus for performing color conversion by using a lookup table indicative of LUT (Look-Up Table) values corresponding to lattice points of a three-dimensional input space including input color signals of three input channels and associating the lattice points to corrected output values by performing interpolation on the LUT values, the color conversion apparatus comprising: a body-center value generating part for generating output values corresponding to a body-center of each cubic lattice block included in the three-dimensional input space; and an interpolating part for interpolating between the output values generated by the body-center value generating part and the LUT values; wherein the cubic lattice block is divided into six quadrangular pyramids, wherein each of the quadrangular pyramids is divided into two tetrahedron blocks by a side parallel to a predetermined straight line and by a plane including a diagonal line of a bottom plane that intersects the side parallel to the predetermined axis; wherein the corrected output values are determined by performing linear interpolation on output values corresponding to body-center points of each of the tetrahedron blocks and using the LUT values corresponding to three lattice points of each of the tetrahedron blocks and three correction coefficients based on a positional relationship of the input color signals inside each of the tetrahedron blocks.