Photographic printing was once a widespread and vital art form in itself. While there were (and are) various techniques for producing prints from film, the most common in the film era was the use of light-sensitive paper and an enlarger -- the paper would be exposed to a film negative or positive transparency (slide film) via the enlarger in a darkroom, or a digital exposure unit such a minilab machine, which you used to find in just about every drugstore.
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