“Blow-up” from 1966. Interesting use of purple background paper. The film was parodied in a Mel Brooks film where the photographer keeps blowing up the whole frame eventually to room-sized prints. It was later remade in an audio version called “Blow Out.”There's an old movie, don't remember its name at the moment, about a reporter who took a photo only to discover he accidently caught a crime in the background. That led him to enlarge his photos in search of more details, until at the end the grain became a Rorschach test. You can scan film at any DPI you want, and there's a soft border of diminishing returns, but at some point the extra details reveal nothing but the film's chemistry.
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