[lug] Looking for image manipulation software

[Paul E Condon]

I'm looking for a software package that will allow me to overlay and subtract one
image from another. Perhaps, all I need is help getting gimp to do what I want.

By subtract, I mean pixel-by-pixel difference of pixel values so that if the two
input images are identical, the result is an blank image. I can get two images overlaid.
I can move one relative to another, and if I spent another few hours looking I might
find a way to input x,y shifts as number of pixels rather than using the mouse to
drag and drop. But even when I do get them overlaid with the mouse, that only increases
the contrast of the image. Choosing modes subtract or difference doesn't help.

Is there some other software that is more oriented towards images as data rather than
images as graphic art?


-- 
Paul E Condon           
pecondon at mesanetworks.net