“Photoshop is a relatively new invention, but even in the very early days of photography, people were figuring out ways to manipulate photos to certain ends. In the late 1800s, spirit photography became popular with hoaxers and those who just wanted to push the medium, though mainly it was hoaxers trying to prove the existence of ghosts.”

http://www.iheartchaos.com/post/11322370159/before-there-was-photoshop-there-was-spirit

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