“Exposed: Software reveals how much photos have been retouched”

The Guardian, November 29, 2011

“There is a better way. Computer image specialists Hany Farid and Eric Kee at Dartmouth College in New Hampshire, US, have come up with a technique that measures how much a digital picture has been manipulated. It ignores trivial tweaks that improve the picture quality and focuses on changes that most alter a person’s appearance.”