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PostScript
Guide to Using Page Description Languages 1-37
Figure 1-9. Image orientation mismatch B
The scan order of an image relative to the content of the image is
not important. It is important that the scan order of the image in
the desired orientation is relative to the scan order of the page.
There are circumstances during which a transformation cannot
be avoided by any ordering of image data (such as when the
image sides are not parallel to the sides of the paper, or when
the image is skewed), but for many cases, you can avoid a
rotation by ensuring that the data in the image is in the correct
order.
Ensuring optimum image data order is complicated by the fact
that the rotations are not tied to the use of the
rotate
operator in
a PostScript program, or to implied rotations in the image-to-user
space transformation. The transformations in the figures above
are automatically performed on data by DocuPrint NPS/IPS
when required as part of rendering. The transformations
specified in PostScript are part of a specification of the desired
position of an image in terms of the default user coordinate
system.
A
A
A
Printer's paper
orientation
Image
Fast
Output
Output
without rotation
Slow
Slow
Output
with rotation
Rotated