Color conversion look-up table generating device, color conversion look-up table correction method, and storage medium

A color conversion look-up table correction method used in a color conversion process of converting a signal value in an input image into a plurality of types of actual color material values, comprising:

• an acquisition step of acquiring an actual color material value of a target grid point in the color conversion look-up table and an actual color material value of a neighbor grid point of the target grid point;
• a conversion step of converting the actual color material value of the target grid point and the actual color material value of the neighbor grid point of the grid point into virtual color material values;
• and
• a correction step of correcting the actual color material value of the target grid point on the basis of a virtual color material amount of the target grid point and a virtual color material amount of the neighbor grid point,
• wherein the virtual color material value is an output value of a virtual color material that absorbs only light of spectral reflectance in each of divided blocks in a case in which spectral reflectance of the actual color material is divided into n (n is an integer of 3 or more) blocks.

A non-transitory computer readable storage medium storing a program for causing a computer to function as a color conversion look-up table generating device used in a color conversion process of converting a signal value in an input image into a plurality of types of actual color material values,

• wherein the color conversion look-up table generating device comprises:
• an acquiring unit configured to acquire an actual color material value of a target grid point in the color conversion look-up table and an actual color material value of a neighbor grid point of the target grid point;
• a converting unit configured to convert the actual color material value of the target grid point and the actual color material value of the neighbor grid point of the target grid point into virtual color material values;
• and
• a correcting unit configured to correct the actual color material value of the target grid point on the basis of a virtual color material amount of the target grid point and a virtual color material amount of the neighbor grid point,
• wherein the virtual color material value is an output value of a virtual color material that absorbs only light of spectral reflectance in each of divided blocks in a case in which spectral reflectance of the actual color material is divided into n (n is an integer of 3 or more) blocks.