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POSTSCRIPT
XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 2-13
• Image data at output device resolution—PostScript image data
that has a resolution matching the output device is typically
transferred directly to the frame buffer with no modification.
These images appear light on certain write-white printers.
• Black lines on a color background print white—PostScript (or
PCL) jobs that have black lines on a color background will print
the lines with white borders. This is a characteristic of write-
white printing.
• Single-pixel fills—Single isolated dots are visible on a
LaserWriter but not on some write-white printers; therefore,
single-pixel isolated fills in PostScript may not be visible on your
product.
You may be able to correct the above situation by means of the
Change Imager Parameters command. Set the
FatScanConversion option to Yes. This should only be used if
needed, because it may degrade performance.
Note: When the copypage operator and darkening are used
together either via the Thicken attribute or a Change Imager
Parameters command, the data printed on every page
generated by copypage becomes progressively darker.
In addition to these PostScript issues, your output may not meet your
expectations if your printer is not set within the Xerox print quality
specification range. Please make sure your printer has been
adjusted by a qualified technician.
Font consistency
If you do not use exactly the same fonts on both printers, you cannot
expect the output to look the same. The actual shape of the
characters in any given font varies among different font
manufacturers. In fact, different versions of a font from the same
manufacturer may have different shapes and character sets.
Because some PostScript printers have fonts permanently installed,
it is likely that newer models may have newer versions of the same
fonts. The font rasterizer software may vary between printer models,
also resulting in output differences.
Proprietary PostScript extensions
Some PostScript printers contain proprietary PostScript extensions.
In general, PostScript masters that use proprietary printer features
may cause appearance inconsistencies between different PostScript
printers.