Image processing apparatus and light source identification method

A light source identification method, comprising:

• obtaining, by a computer, information sets each relating to positional relationships between color coordinates corresponding to a plurality of reference colors under a light source among a plurality of predetermined light sources, wherein the plurality of reference colors are set in a color space, and the information sets respectively correspond to the plurality of predetermined light sources;
• and
• detecting, by the computer, color coordinates of the plurality of reference colors from an object image, and identifying a light source used in capturing of the object image, based on a similarity between positional relationships of the detected color coordinates and the positional relationships of color coordinates specified by each of the information sets obtained from the memory.

A non-transitory computer-readable storage medium storing a computer program that causes a computer to perform a procedure comprising:

• obtaining information sets each relating to positional relationships between color coordinates corresponding to a plurality of reference colors under a light source among a plurality of predetermined light sources, wherein the plurality of reference colors are set in a color space, and the information sets respectively correspond to the plurality of predetermined light sources;
• and
• detecting color coordinates of the plurality of reference colors from an object image, and identifying a light source used in capturing of the object image, based on similarity between positional relationships of the detected color coordinates and the positional relationships of color coordinates specified by each of the information sets obtained from the memory.