Xerox WorkCentre 490cx, Руководство пользователя

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6-10 Scanning
256 Colors
Images scanned in 256 Colors mode are scanned in a maximum of 256
colors. The quality is not as high as True Color, RGB, but it is acceptable
for most applications. File sizes are considerably smaller than those of True
Color, RGB. An A4-size 300-dpi 256 Color image may require 8 megabytes
of storage space (uncompressed). Photographs may be successfully scanned
in 256 colors.
Gray 256 Scales
Images scanned in Gray 256 Scales mode are scanned in 256 shades of gray.
If high quality copies of photographs or other continuous tone originals are
desired, Gray 256 Shades mode is the best choice.
Gray 256 Scales provides accurate representation of black and white, and
intermediate gray shades between black and white, for each individual
pixel. It actually provides 256 shades, representing white by the value 255
and black by the value zero, with progressively lighter intermediate shades
of gray by values from 1 through 254.
Gray 256 Scales
Halftone B/W
Lineart B/W