Performance and Image Quality Xerox® DocuMate® 4799 and 4790
3-4 Performance and Image Quality Expectations Guide
Color
Simplex/Landscape (600 dpi)
Reference Scanner Xerox DocuMate 4799
Scan Speed 37 seconds (1.85 sec/page) 77 seconds (3.85 sec/page)
RDO file size 139 MB 68.9 MB
Save as PDF with Xerox option 44.7 MB 66.6 MB
Save as PDF with Acrobat
option
142.4 MB 70.4 MB
Duplex/Landscape (600 dpi)
Reference Scanner Xerox DocuMate 4799
Scan Speed 115 seconds (5.75 sec/page) 110 seconds (5.5 sec/page)
RDO file size 159 MB 84.1 MB
Save as PDF with Xerox option 64.6 MB 88.7 MB
Save as PDF with Acrobat
option
163.4 MB 85.9 MB
Summary
The Xerox DocuMate 4799 achieves fast scanning speeds for duplex (two-sided) black and
white and grayscale documents as a result of the Duplex Automatic Document Feeder (ADF),
which supports simultaneous two-sided scanning— and speeds, on average (simplex/duplex),
which are comparable to the Reference Scanner for color documents for most scanning
applications.
While not as efficient at transferring large amounts of data as the SCSI interface on the
Reference Scanner, the Hi-speed USB 2.0 interface on the DocuMate 4799 is suitable for most
scanning applications, offers the added convenience of plug and play and does not require
adding a separate controller board to the PC.
Saving files to PDF using the Xerox option produces noticeable larger file sizes for grayscale
documents and is not recommended.
Image Quality
A variety of industry standard test patterns and images were used to objectively evaluate the
Xerox DocuMate 4799 and its ability to accurately capture (and reproduce) fine detail (text
and line art), or shades of gray and different colors (color depth). Both the Xerox DocuMate
4799 and the Reference Scanner support 24-bit color depth and are capable of assigning one
of 16.8 million values to a color. For scanning monochrome or grayscale images, the Xerox
DocuMate 4799 supports 8-bit grayscale (1-bit black and white) while the Reference Scanner
supports 1-bit black and white.
