Xerox
®
DocuMate
®
3640
User’s Guide
179
Error diffusion, Bayer, and Halftone pattern
Error diffusion, Bayer, and Halftone patterns are the intentional application of noise (dithering) in
the image to help alleviate banding when scanning in binary (black and white) mode. For example, if
you scan a color photo in black and white, the image file will have large blocks of black and white and
the image barely recognizable. Dithering the image creates a black and white image that is
recognizable.
Below is an example of a color scan, a black and white scan without dithering, and a black and white
scan with dithering. When the image is scaled down, it may look like a grayscale scan. When the image
is at normal size or enlarged you will be able to clearly see the dithering pattern, as shown in the close-
up image.
Bayer dither scan - Close up
Fill Margin Holes
Select this option if you are scanning pages with punched holes in the margins. This option will fill
these holes with the detected background color in the final scan. The scanner will detect and fill the
holes under the following conditions:
• The size of the hole can be between approximately 4 mm and 12 mm
• The maximum width of the margin is 25.4 mm from the edge of the paper
• The size of the margin is 24.4 mm
Color scan
Black and White scan Bayer dither scan
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