DiffImg

DiffImg is a program that compares two images of the same size. It returns statistics associated with this comparison, such as the number of pixels that are different, the average deviation, and the standard deviation. The positions where the pixels are different are shown as a color mask.

A color mask is an image that uses colors to indicate the differences between two images. The color of each pixel in the mask corresponds to the magnitude of the difference between the pixels at the corresponding positions in the two images. White pixels indicate pixels that are the same in both images, black pixels indicate pixels that are different in both images, and all other colors indicate pixels that are partially different.