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POSTSCRIPT
XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 2-23
PostScript printer description (PPD) files
PostScript printer description files (PPD files) are readable text files
that provide information about the special features of your printing
device to the application program running on your host system. PPD
files include information about page sizes, finishing features, and
fonts, among other items.
PPD files are stored on a client workstation or PC where they can be
parsed by applications. Some application programs supply PPD files
for a variety of printers, rather than have you contact printer
manufacturers to obtain one.
The DocuPrint PPD files provided with DocuPrint software conform
to version 4.2 of Adobe PPD specifications. If your application
software supports version 4.2 PPD files, the DocuPrint PPD files
should be used when generating print documents from your
application.
If your application does not support version 4.2 of the PPD
specification, the Generic PPD file can be used. In the cases where
using the LaserWriter PPD file results in PostScript code that
contains operations not supported on DocuPrint, use the “NULL”
PPD file that is available with some applications.
Implementation limits
Features that are known to be device dependent (see the Adobe
PostScript Language Reference Manual, 2nd edition, for a list) may
differ from other implementations. These include performance, VM
usage, certain kinds of shading and line thickness, some kinds of
halftoning, resolution dependencies, and certain implementation
limits.
The following table lists the implementation limits that are not defined
in the PostScript standard, but are inherently different on PostScript
devices.