Xerox DocuMate 3220 User Manual

Xerox
®
DocuMate
®
3220
User’s Guide
174
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
Color scan
Black and White scan Bayer dither scan

Xerox DocuMate 3220 Specifications

General

Film scanning	No
Color scanning	Yes
Input color depth	- bit
Maximum scan size	222 x 965 mm
Output color depth	24 bit
ADF scan speed (b/w, A4)	23 ppm
ADF scan speed (color, A4)	13 ppm
Optical scanning resolution	600 x 600 DPI
Duplex ADF scan speed (b/w, A4)	46 ipm
Duplex ADF scan speed (color, A4)	26 ipm
Scanner type	Flatbed & ADF scanner
Product color	Gray
Sensor type	CIS
Scan drivers	TWAIN, WIA
Daily duty cycle (max)	1500 pages
Auto document feeder (ADF) input capacity	65 sheets
USB version	2.0
Standard interfaces	USB 2.0
Minimum RAM	512 MB
Minimum storage drive space	350 MB
Bundled software	Visioneer OneTouch\\r Nuance PaperPort\\r Nuance OmniPage Pro
Sustainability certificates	ENERGY STAR
Certification	RoHS
Maximum ISO A-series paper size	A4
Power supply type	-
Package depth	592.07 mm
Package width	400.04 mm
Package height	284.98 mm
Package weight	6708 g
Compatibility	Xerox DocuMate Scanners
Country of origin	China

Weight and Dimensions

Depth	452 mm
Width	323 mm
Height	124 mm
Weight	3800 g