Phototypesetting is a method of
setting type, rendered obsolete with the popularity of the
personal computer and
desktop publishing software, that uses a
photographic process to generate columns of type on a scroll of photographic paper. Typesetters used a machine called a
phototypesetter, which would quickly project
light through a
film negative image of an individual character in a
font, through a lens that would magnify or reduce the size of the character onto
film, which would collect on a spool in a light-tight canister. The film would then be fed into a processor, a machine that would pull the film through two or three baths of chemicals, where it would emerge ready for
paste up.
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