Image processing apparatus, image processing method, and storage medium using image processing technique for evaluating colors of a captured object

A non-transitory computer readable storage medium storing a program to cause a computer to execute a method comprising:

• obtaining a first image and a second image obtained by capturing images of a target object under different capturing conditions;
• obtaining area information for each of the first image and the second image, the area information being set in an area corresponding to the object and specifying a reference area serving as a reference for comparison and a comparison target area serving as a target for the comparison;
• generating a color conversion parameter for carrying out a color conversion such that a color value of the reference area in the second image coincides with a color value of the reference area in the first image;
• and
• carrying out, based on the color conversion parameter, the color conversion of the color value of the reference area and a color value of the comparison target area in the second image and deriving a color difference between the reference area and the comparison target area in the second image after the color conversion.

A method comprising:

• obtaining a first image and a second image obtained by capturing images of a target object under different capturing conditions;
• obtaining area information for each of the first image and the second image, the area information being set in an area corresponding to the object and specifying a reference area serving as a reference for comparison and a comparison target area serving as a target for the comparison;
• generating a color conversion parameter for carrying out a color conversion such that a color value of the reference area in the second image coincides with a color value of the reference area in the first image;
• and
• carrying out, based on the color conversion parameter, the color conversion of the color value of the reference area and a color value of the comparison target area in the second image and deriving a color difference between the reference area and the comparison target area in the second image after the color conversion.