diffimg - Calculates intersection between two images
diffimg image1 image2 [outimage]
diffimg generates an image where each pixel is the difference between the
corresponding pixel in each of the two source images. Thus, if the source
images are the same the resulting image will be black, otherwise it will have
regions of non-black where the images differ.
Currently supports: .png, .gif, .jpg, and .ps by using
ghostscript
diffimg was written by John Ellson <ellson@research.att.com>
This manual page was written by David Claughton
<dave@eclecticdave.com>, for the Debian project (but may be used by
others).