A printing or photographic process where an image is made to match or correspond exactly with another image.
From Greek auto- (self) plus anti- (against, opposite) plus typos (impression, type), literally meaning 'self-opposite impression.' It's a technical term from early printing and photography.
This is a super obscure word from the early days of photography—it describes a technique where you could create a mirror image or matching print, which was basically the 19th-century version of copy-paste!
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