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Originally Posted by Marco_flavio
To be sur that the pic are not photoshoped.
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Some information can be gleaned from EXIF data and EXIF reading programs to determine some things but if you are trying to determine fakes often using a graphical editing program can help. You can run various filters on the image like histograms and edge detection to determine obvious fakes. More elaborate fakes take a somewhat discerning eye and there are tutorials on the net on this. The bad fakes can be spotted fairly quickly though as there are a lot of tell tale giveaways.