Xerox DocuMate 3220 User Manual page 174

Error diffusion, Bayer, and Halftone pattern
, , and
Error diffusion Bayer
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.
Color scan
Bayer dither scan - Close up
174 ®
Xerox DocuMate
User's Guide
are the intentional application of noise (dithering) in the
Halftone patterns
Black and White scan
®
3220
Bayer dither scan