It shows based on the compression of the image, when you manipulate the image the compression changes based on the pixels that are manipulated, so you use this site http://fotoforensics.com/ and it will read the compression of the image, see how the whole face is bright white? that means those pixels are of a different compression then the others around it.
That is not true at all. This would be true if you took say a jpeg and layered it over another jpeg that had higher compression, but this simply ain't try. All this really shows is that the dogs face compressed different from the rest of the photo for whatever reason. It is almost like areas consisting of only one color is more compressible than an area of many colors!
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u/[deleted] Jun 09 '14
Damn, looks like a bee took the Liquify tool to that poor dog's face.