I have a series (~500) of images, and corresponding image 'diffs' created by PerceptualDiff (http://pdiff.sourceforge.net/) and I want to create a composite of them to show the most changed areas in the original image sequence. I've tried a script with 'composite -blend' but it didn't work. '-evaluate-sequence add' seems to be close to what I want but I don't want to just add the images together.
For example, if I have 3 diff files which each comprise 3 pixels in a horizontal line - the first file is 3 black pixels; the second file is 2 outer black pixels with one white pixel in the middle; the third file is a black left-most pixel and a white middle and right pixel - as I understand it, if i use '-evaluate-sequence add' I will get a resultant file that is identical to the third file in my example. What I would want in the composite is the left pixel to be black, the middle to be 2/3 white (since the white occurs in 2 out of the 3 diffs) and the right to be 1/3 white - ie a 'representative' composite.
Hope that makes sense! Sorry for being wordy. Please help
