Xerox Document Centre 470cx, Online User'S Manual

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6-14
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.
Halftone B/W
This scan mode uses various combinations of black and white
pixels to simulate gray scales. While not the same level of image
quality as the Gray 256 Scales image type, this image type is good
for continuous tone images where smaller file size is more
important than ideal image quality.
In this scan mode, each pixel of the image has two possible states:
on (black) or off (white). This means that each pixel can be
represented by 1 bit. For this reason, the file size is much smaller
than that of a document scanned in the Gray 256 Scales mode,
which uses 8 bits to define 256 shades of gray.
Lineart B/W
Lineart B/W mode is generally the best choice for printed text or
pen-and-ink drawings.
Like the Halftone B/W image type, this image type defines the
state of each pixel in the image with one bit that is either on or off.