Software That Exposes Faked Photos - NYTimes.com: "In the age of Photoshop, detecting manipulated photos is a growing priority for lawyers, journalists and people involved in law enforcement and national security. To determine an image’s authenticity, the software uses geometric formulas to detect and analyze shadows that are invisible to the naked eye, then lines them up with a potential light source. If it cannot do so, it deems the image to be physically implausible."
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