Xerox 4790 specifications Image Quality, Summary

Performance and Image QualityXerox® DocuMate® 4799 and 4790

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	142.4 MB	70.4 MB
option

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	163.4 MB	85.9 MB
option

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.

3-4 Performance and Image Quality Expectations Guide