Authenticating Photos: How Many Modes of Manipulation Are There (and, Boy, Are They Easy To Do)

There was perhaps a time when the business of authenticating photographs and images didn't attract much attention. With the advent of the digital age, that lack of interest had better stop. See David Pogue, Photoshop and Photography: When Is It Real?, NYTimes (Feb. 25, 2010)

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The dynamic evidence page

It's here: the law of evidence on Spindle Law. See also this post and this post.