Optimizing Print Quality; Product Features That Affect Postscript Print Quality; Proprietary Postscript Extensions - Xerox DocuPrint 4090 IPS Troubleshooting Manual

5.

Optimizing print quality

This chapter discusses methods of checking and improving print
quality.
NOTE: One way to test print quality is to print a sample
document. For information on printing sample documents, refer
to The Guide to Configuring and Managing the System.

Product features that affect PostScript print quality

You can improve the appearance of your documents by being
aware of potential problems created through the use of
proprietary PostScript extensions and device-dependent
operators.

Proprietary PostScript extensions

PostScript masters that use proprietary printer features may
cause appearance inconsistencies between different PostScript
printers. Some PostScript printers contain proprietary PostScript
extensions. For example, some versions of the Apple Macintosh
PostScript driver download encrypted proprietary image
"smoothing" operators to Apple LaserWriters. The downloaded
PostScript code uses the product operator to determine if it is
being used on a LaserWriter. If not, the proprietary code is
bypassed by doing a flushfile. This allows the PostScript master
to print on non–LaserWriter products. As a result, PostScript
masters generated on a Macintosh with Apple proprietary
features may produce output that varies between LaserWriter
and non–LaserWriter PostScript printers.
Troubleshooting Guide 5-1