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1-26 Guide to Using Page Description Languages
– The resolution of the source image (sampled image) is
higher than the device resolution. Scan Conversion paints
those pixels whose centers lie within the shape.
– The resolution of the source image (sample image) is
lower than the device space, and the scaling of source-
image-to-device space is an integer multiple and rotation
is in multiples of 90 degrees.
• Scan Conversion paints any pixel whose square region
intersects the shape if the resolution of the source image is
lower than that of device space, and the scaling between
source image and device space is not an integer multiple.
This effect is noticeable when you are printing a sampled image
with a resolution of less than 600 dpi on the printer at 600 dpi.
Image quality
The output of DocuPrint NPS/IPS printers that use write-white
technology can be superior to the output of many printers that
use “write-black” technology; the difference appears in the
following areas:
• Black regions are darker.
• Fonts of small point sizes are more readable.
• Single-pixel-wide white lines on a black background are
visible.
NOTE: The DocuPrint 92C NPS/IPS can produce a single-pixel
line. However, because of the many variables involved, such as
print density settings and line placement on the page, Xerox
cannot guarantee the quality of these single-pixel lines. Specific
questions regarding single-pixel line printing for your application
should be directed to your Xerox service engineer.
Some user-defined fonts use either outlines or bitmaps that are
tuned to write-black printers. As a result, these fonts appear light
on the Xerox DocuPrint printers. Character rasterization for fonts
that use PostScript painting operators is subject to the scan
conversion rules described earlier in this chapter.