Xerox FreeFlow® Print Server version 6.0 - Manual (Page 104)

8 - 6 System Guide
Hints and Tips
variable objects to be overlaid on fixed underlays or backgrounds,
it is also important to ensure that the objects are properly cropped
or bounded and at the lowest acceptable resolution. The Print
Server can compose 2 variable data objects of 2 inches by 2
inches and 300 dots/inch resolution about 10-20 times faster than
it could if the same objects were 600 dpi and 8.5x11 inches.
Image Quality (IQ)
Generally the image quality of a base printing system is above
average and the Image Quality (IQ) enhancements filters provided
within the Xerox FreeFlow Print Server is unnecessary. If you wish
to improve output IQ, the Print Server provides separate controls
for enabling Anti Aliasing, Trapping, and Intelligent Black
Overprint.
Disabling all three of these IQ filters improves performance. If you
are printing only a small number of copies, the expected increase
in RIP time is visible as a significant fraction of the total job
processing time.
When printing documents with a large a number of copies, then
the majority of the processing time is devoted to the actual printing
and the RIP performance decrease is less visible (a smaller
fraction of the total job time). You should examine the Xerox
FreeFlow Print Server printed output with the IQ enhancing filters
enabled and disabled and decide whether the IQ improvement is
worth the performance drop for this particular job.
On DC 2045/2060/6060/5252 and 8000 there are certain
scenarios in which the printer will cycle down and do an Image
Quality (IQ) adjustment. The percent area coverage of the page
(that is, amount of image/text written on the page) also effects the
number of IQ adjustments that the printer makes. A standard letter
size page (8.5x11 inches) is about 21.6x27.9 cm or about 603.5
square cm.
If the text and images written to a page cover more than about 250
square cm (about 40% of the page), then the print engine
automatically generates IQ adjustments.
If you find that a particular document seems to take a long time to
print because of IQ adjustments, improve performance by
simplifying the page. For example, the text and images on the
page might be downsized to cover less than 40% of the viewable
area of the paper and the performance may improve because the
printer does fewer IQ adjustments.
The DC 2045/2060/6060 print engine also performs IQ
adjustments if a difficult job is being processed and RIP falls
behind the print output. If this occurs, the print engine will cycle
down for a few seconds while the RIP catches up and then it
performs an IQ adjustment which takes anywhere from 5-95
seconds. During the IQ adjustment, the printer does not print
anything. However, the RIP continues and be slightly ahead. As