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JPEGsnoop - Identifying Edited Photos

Simply open an image in JPEGsnoop and scroll down to the section titled, *** Searching Compression Signatures ***. This option can be enabled/disabled with the Signature Search item in the Options menu.

The utility will compare the compression characteristics of the photo against an internal database of thousands of camera "signatures" to locate a match. If a match is found, the matching digital camera or editor is shown. If the signature matches a photo editor (such as Photoshop), then there is a good chance that the photo has been edited (i.e. not original!).

The assessment line indicates one of four possible outcomes:

Class 1 - Image is processed/edited

Class 2 - Image has high probability of being processed/edited

Class 3 - Image has high probability of being original -- NOTE: Please see description below!

Class 4 - Uncertain if processed or original

http://impulseadventure.com/photo/jpeg-snoop-identify-edited-photos.html