Xerox WorkCentre 480cx User Manual page 200

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Color Channel
The Color Channel radio buttons are used to specify the color channel in
which to change the Highlight, Shadow and Midtone values.
Gray Channel
The Channel Selector allows you to select an active channel.
The Gray Channel is the only channel available when the scanned image is
scanned as Gray 256 Scales, Halftone, B/W, and Lineart, B/W. The Gray
Channel is also available when the scanned image is scanned in True Color,
RGB or 256 Colors.
Red, Green, Blue Channels
The Red, Green, and Blue Channels are available when the scanned image
is scanned in True Color, RGB or 256 Colors.
With color scanning selected, you may select a color channel from the
above set of buttons. This will allow you to adjust the highlight, shadow,
and midtone for each color in the Red, Green, and Blue spectrum.
6-22 Scanning