Digital detectives discern Photoshop fakery

Spotting inconsistencies in pictures is a major aspect for computer forensics. “One helpful aspect of digital files is that they leave records, whether you know it or not,” says Nasir Memon, a computer science professor at Polytechnic University in New York City. “Whatever you do to an image, it will leave tell-tale signs – artifacts hidden in pictures.” Scouring for these digital imperfections led computer security consultant Neal Krawetz to develop techniques of determining what specific areas of an image have been altered. He can even trace the history of those changes…

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