PPDs for Non-PS Printers on UNIX
CUPS does not limit itself to “real” PostScript printers in its use of PPDs. The CUPS developers
have extended the scope of the PPD concept to also describe available device and driver options for
non-PostScript printers through CUPS-PPDs.
This is logical, because CUPS includes a fully featured PostScript interpreter (RIP). This RIP is based on
Ghostscript. It can process all received PostScript (and additionally many other file formats) from clients.
All CUPS-PPDs geared to non-PostScript printers contain an additional line, starting with the keyword
. This line tells the CUPS print system which printer-specific filter to use
for the interpretation of the supplied PostScript. Thus CUPS lets all its printers appear as PostScript
devices to its clients, because it can act as a PostScript RIP for those printers, processing the received
PostScript code into a proper raster print format.