Discovering Altered Images

By Deane Barker on August 20, 2005

photofakery: This is a very log and dense article, but it provides some good, basic advice for figuring out if a digital image has been altered in some way.

A common inconsistency found when the image content is altered is the mismatch of radiometric or illumination conditions between the altered part and the rest of the image. The altered part of the image may have shadowing that is not consistent; indicating that is was illuminated under different conditions from rest of the image

Whoever wrote this has been around the block a few times.