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[qimg]http://i246.photobucket.com/albums/gg117/ThePsychoClown/G3.jpg[/qimg]
Remarkably similar, yes.
Exactly the same, no.
Stray Cat, I suggest, in the interest of science, that you supply copies of both photos to other parties without telling them why or which was which. Independently, ask them to draw in the lines where the contrast changes, but do not attempt to define a threshold for them.
My guess is that those lines will differ from yours, since there is a significant element of subjectivity.
Then superimpose all the lines from all the drawers and see what happens. My guess is they won't line up
even from the same source image.
Also, you may be unaware of how brightening or darkening can change the apparent location of a contrast change. I'm sorry I don't have time to illustrate this, but I see it all the time. Take one test image and draw your lines. Then, using
the same image, brighten it enough to make it "bloom," and try drawing the lines again (better yet, let someone else do it both times while you aren't present). I can guarantee that the lines will not match. So trying this technique with two images with drastically different contrasts is surely doomed to failure (or success, if your intention is to prove they aren't the same).
So what you've done is take two images that could never be lined up properly anyway based merely on their photographic characteristics, then used the results to "prove" they are different. The fault lies in the invalid and meaningless technique, and is a favorite of woos with Oswald and Bigfoot images.