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PostScript:: n. A Page Description Language (PDL), based on
   work originally done by John Gaffney at Evans and Sutherland in
   1976, evolving through `JaM' (`John and Martin', Martin Newell) at
   XEROX PARC, and finally implemented in its current form by
   John Warnock et al. after he and Chuck Geschke founded Adobe
   Systems Incorporated in 1982.  PostScript gets its leverage by
   using a full programming language, rather than a series of
   low-level escape sequences, to describe an image to be printed on a
   laser printer or other output device (in this it parallels
   EMACS, which exploited a similar insight about editing
   tasks).  It is also noteworthy for implementing on-the fly
   rasterization, from Bezier curve descriptions, of high-quality
   fonts at low (e.g.  300 dpi) resolution (it was formerly believed
   that hand-tuned bitmap fonts were required for this task).  Hackers
   consider PostScript to be among the most elegant hacks of all time,
   and the combination of technical merits and widespread availability
   has made PostScript the language of choice for graphical