Xerox DocuMate 3640 User Manual page 60

• Reduce Moiré patterns—moiré patterns are wavy, rippled lines that sometimes appear on the
scanned images of photographs or illustrations, particularly newspaper and magazine
illustrations. Selecting Reduce moiré patterns will limit or eliminate moiré patterns in the scanned
image. This option is only available when scanning in Color or Grayscale at lower resolutions, and
when the scanner supports this feature.
If you are scanning using an Automatic Document Feeder, and the page is fed through at too
great of an angle, the image may not straighten correctly. In that case, re-scan the page using the
paper guides to feed the paper in straight.
• Invert image—reverses the color of each pixel in the scanned image.
When scanning in black and white, each pixel is reversed from black to white and white to black.
When scanning in grayscale each pixel is reversed to the opposite level of gray. When scanning in
color each pixel is reversed to the opposite color in the color wheel.
For example, you might choose this option if you are scanning pages that have been printed from
newspaper microfilm. Newspaper microfilm reverses black and white so that when viewed on a
monitor, the text is white and the paper is black.
The following example shows the original grayscale image and the inverted image.
The following example shows the original color image and the inverted image.
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Xerox DocuMate
User's Guide
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3640