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Scanning from TWAIN and WIA
Xerox
®
DocuMate
®
4790
User’s Guide
7-149
Despeckle
This option removes speckles from the background. Speckles are small spots on an image that the scanner
interpreted as a valid part of the document. For example, an irregularity in the paper, a small wrinkle, or holes
where a staple was removed may show up as speckles in the scanned image. The Despeckle option identifies
these spots and removes them. This option is only available when scanning in black and white.
Radius—this is the size of the area that is evaluated for stray dots.
Image Emphasis
Select how much to emphasize image content when scanning printed items. You can use Image emphasis to
improve the clarity of the scanned images by sharpening the appearance of lines within the image. The Smooth
option works best for scanning photos to keep the colors in the pictures blending smoothly together. The options
for Low, Medium, or High increase the sharpness of the lines in the scanned image and work best when scanning
text documents. The Automatic option tells the scanner to attempt to choose the best emphasis level based on
the items currently being scanned. This option is only available when scanning in Color or Gray.
Here is an example of text at a 4 point font size scanned with the Image emphasis set to None and scanned a
second time with the Image emphasis set to High. The scanned examples are enlarged to show details.
Moiré Reduction
Moiré patterns are wavy or rippled lines that may appear in the scanned images of newspapers and magazines,
and sometimes scanned images of photos, line drawings, and color scans of textured paper. Select the Moiré
reduction option to have the driver attempt to find and remove moiré patterns from the image. Please note that
when Moiré reduction is enabled the scanner may scan slower as the image is checked for moiré patterns. This
option is only available when scanning in Color or Gray.
Original text:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
abcdefghijklmnopqrstuvwxyz
ABCDEFGHIJKLMNOPQRSTUVWXYZ
abcdefghijklmnopqrstuvwxyz
Scanned with no image emphasis: Scanned with high image emphasis:
Image with moiré patterns Image with moiré patterns
removed