POSTSCRIPT
For any image, there are eight such sequences (four scan origin possibilities, with either a row or a column order choice for each). Any of these sequences may be used in a PostScript program as long as the
Purpose
There is one sequence in each case that enables the fastest processing on DocuPrint NPS. You should know why there is a difference in speed depending on the order chosen, and how to choose the optimum order.
The laser scans the image area in a specific order relative to the paper to produce the output image. For DocuPrint, the fast laser scan direction is parallel to the long edge of the paper, and the slow laser scan direction is parallel to the short edge of the paper. The fast scan direction is in the direction of increasing y coordinates and the slow scan direction is in the direction of increasing x coordinates in the PostScript default user space, with the y axis corresponding to the long edge of the paper. Refer to the Adobe PostScript Language Reference Manual for more information.
When an image is used in a document, it is placed in a specific orientation on a page. The orientation of fast and slow scan directions for the image relative to those for the entire output page is important. If the directions for the image do not match the directions for the page, extra processing must be done at the printer to reorder the image data.
The most
Figure 2-8. Image orientation mismatch A
Printer’s paper
orientation
Image
A
Fast
Fast
Rotated
A
Slow
Output
without rotation
Output
A
A
Output with rotation
XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES |
