Is there any way to get pixels that don't match to either be 100% or 0% transparent?
XOR gives me very similar results to Negation - lots of black where the images are the same, and wild technocolor where they're different.
My end goal is to use the background that I've assembled to easily remove the background on a stack of images, replacing it with either white or transparency, and I'm trying to find a way to do that without having to try and select edges and manually erase pixels from each individual image.