Editing Typesetting (section)

===Phototypesetting===
{{Main|Phototypesetting}}
[[Image:Linotype CRTronic 360.jpg|thumb|200px|Linotype CRTronic 360 photosetter, a direct entry machine]]
[[Phototypesetting|Phototypesetting or "cold type"]] systems first appeared in the early 1960s and rapidly displaced continuous casting machines. These devices consisted of glass or film disks or strips (one per [[font]]) that spun in front of a light source to selectively expose characters onto light-sensitive paper. Originally they were driven by [[punched tape|pre-punched paper tapes]]. Later they were connected to computer front ends.

One of the earliest electronic photocomposition systems was introduced by [[Fairchild Semiconductor]]. The typesetter typed a line of text on a Fairchild keyboard that had no display. To verify correct content of the line it was typed a second time. If the two lines were identical a bell rang and the machine produced a punched paper tape corresponding to the text. With the completion of a block of lines the typesetter fed the corresponding paper tapes into a phototypesetting device that mechanically set type outlines printed on glass sheets into place for exposure onto a negative [[film]]. Photosensitive paper was exposed to light through the negative film, resulting in a column of black type on white paper, or a [[Galley proof|galley]].  The galley was then cut up and used to create a mechanical drawing or [[paste up]] of a whole page.  A large film negative of the page is shot and used to make [[Printing plate|plate]]s for [[offset printing]].