Specifications
6-34
Guide to Printers and Printing
/usr/sbin/lpadmin –p ps1 –T PS–b –I PS
As part of the installation procedure, you may want to install fonts on the printer or
downloadable fonts on the computer. See Installing and Maintaining PostScript Fonts on
page 6-34 for details.
Installing and Maintaining PostScript Filters
The PostScript filters provided cover the majority of situations. In certain circumstances,
however, you may find it helpful to change the filter descriptions and install the filters
differently. This section describes the location and function of these filters.
PostScript filters are contained in the directory /usr/lib/lp/postscript.
Note: There are two types of filters: fast filters and slow filters. For definitions of these
types, see lpfilter and Defining a Filter on page 6-21.
A prerequisite of communication between any system and a PostScript printer is the
presence of the postio or the lp.cat filter on the system. Those programs are the only
mandatory PostScript filters that communicate directly with the PostScript printer. The
following filters allow other types of documents to be translated to PostScript and to be
printed on a PostScript printer.
PostScript Filters
File Content Type Filter
simple postprint
troff dpost
daisy postdaisy
dmd postdmd
tek4014 posttek
plot postplot
The following filters perform special functions:
Special Purpose Filters
Function Filter
Communicate with printer postio, lp.cat
Download fonts download
Reverse or select pages postreverse
Matrix gray scales postmd
Installing and Maintaining PostScript Fonts
One of the advantages of PostScript is its ability to manage fonts. Fonts are stored in outline
form in the Type 1 format, either on the printer or on a computer that communicates with a
printer. When a document is printed, the PostScript interpreter generates each character as
needed (in the appropriate size) from the outline description of it. If a font required for a
document is not stored on the printer being used, it must be transmitted to that printer
before the document can be printed. This transmission process is called downloading fonts.
Fonts are stored and accessed in several ways.
• Fonts may be stored permanently on a printer. These printer–resident fonts may be
installed in ROM on the printer by the manufacturer. If the printer has a disk, fonts may
be installed on that disk by you (that is, by the Print Service administrator). Most