Editing Phototypesetting (section)

===Background===
Phototypesetting machines project characters onto film for offset printing. Prior to the advent of phototypesetting, mass-market typesetting typically employed [[hot metal typesetting]] – an improvement introduced in the late 19th century to the letterpress printing technique that offered greatly improved typesetting speed and efficiency compared to manual typesetting (where every [[Sort (typesetting)|sort]] had to be set by hand). The major advancement presented by phototypesetting over hot metal typesetting was the elimination of the metal type altogether, which was not needed by the offset printing process. This cold-type technology could also be used in office environments where hot-metal machines (the [[Linotype machine|Linotype]], [[Intertype Corporation|Intertype]] or [[Monotype System|Monotype]]) could not. The use of phototypesetting grew rapidly in the 1960s when software was developed to convert marked-up copy, usually typed on paper tape, to the codes that controlled the phototypesetters.