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As a skeptical consumer, you’ve probably looked at photos in the news or a piece of advertising and thought, “Hey, I bet that was faked, because no cat/person/burger is that perfect.” Now with a little help from Photoshop, and Tim Mathenson’s tutorial [NOTE: Looks like the page linked here has been changed or removed since this story was posted in 2007, but the steps remain below], you can tell. • Open Photoshop • Open questionable image • Press CTRL+U or go to Image -> Adjustments -> Hue/Saturation • Set Hue to low • Set Saturation to high • Scroll the light bar back and forth, looking for areas of the image that don’t match • If you find a splotch of discoloration, that may indicate the picture was retouched.
HOW TO: Tell If Images Were Faked - Consumerist