Hey,

I just wanted to update the forum on progress. I was able to use the nuance of Photoshop to dial in the subtract features and achieve results like these.

For developing this technique, some alignment algorithms that don't deform the image could be really useful, but for me it's easier to do this manually in Photoshop than to achieve it in Mathematica.

Attachments:

By the way, this is what you get with ImageCorresponding points:

   Show[ImageResize[images[[1]], 300], 
 Graphics[{Green, Disk[#[[1]], 2]} & /@ 
   Transpose[
    ImageCorrespondingPoints[ImageResize[images[[1]], 300], 
     ImageResize[images[[2]], 300]]]], 
 Graphics[{Red, Disk[#[[2]], 2]} & /@ 
   Transpose[
    ImageCorrespondingPoints[ImageResize[images[[1]], 300], 
     ImageResize[images[[2]], 300]]]], 
 Graphics[{Thick, Line[#]} & /@ 
   Transpose[
    ImageCorrespondingPoints[ImageResize[images[[1]], 300], 
     ImageResize[images[[2]], 300]]]]]

which gives

so this does not really appear to be useful for you.

Cheers, Marco