Disclaimer: I don't apologise for the size of the screenshots in this post, as the detail is significant. Those with sub-size outdated LCD's or slow internet connexions can just suffer. It's the way of things.
Awhile back, SnakeByte turned me on to what has to be the greatest "Compare" programme known to Man, God, Vishnu, and that guy who mugged your mum last week, Beyond Compare
. This thing (aside from not being free) makes all other File Comparison applications look like they're still in nappies. It can compare Files, Folders, whole Drives, Registries (!), Images, even MP3's - via content, binary/interpreted, etc, etc, etc. Yes, we all have our favourite applications for comparing things, and this is mine.
But that's not the point of this post - merely the cause.
About 6 months ago on this forum I did a tongue in cheek triptych series of doctored photographs of Nikos as Mother Teresa, Nikos as a Castro Supporter, and Nikos as an evil Greek Dictator.
The other day I was playing around using Beyond Compare to look at and display the "differences" between the source photos and the end result, and I found something disturbingly odd about the Castro image (the middle one, above). At the time I thought it would be humorous to replace the head of the guy in the NSA shirt on the far left with fgagnon's forum avatar, I just started up Gimp and the job was done. But, when comparing the source files recently (before/after) something weird showed up.
Beyond Compare has four formats for displaying the (main) differences between two photographs - Blend Mode, Binary Operation Mode, Mismatch Range Mode, and Tolerance Mode.
The original image is in the left panel, the "after" image in the right panel, and the edited differences displayed graphically in the centre panel highlighted as colour (the unchanged parts are displayed in black and white). Obviously what we're concentrating on here is the centre panel.
First, Blend Mode just shows the pixels overlayed in a blurry sort of mess:
Binary Operation gives the literal pixel distinction in contrast:
Masmatch Range Mode is sort of a Mark Twain on Drugs result:
But, and most importantly of all, Tolerance Mode reveals a snarling demon hiding in Fred's Soul, which, quite frankly, is a little weird:
So if Jesus can appear in a Tortilla, the Virgin Mary in a sliced Tomato, or Che Guevara in a Swirl of Sand, who's to say that Fred's inner-Demon can't be revealed by a simple superimposition with a 51 year old photograph?
I do, however, like to think there's still grace in his heart. :D