Xerox Document WorkCentre 480cx Online User's Manual page 233

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Shadow
The Shadow value represents the darkest value in an image. All
pixels below this point will be rendered as pure black. If you
subsequently broaden the shadow points on the Level Adjustment
graph, the pixels will be re-mapped within the new range thus
allowing you to see more detail in the image.
The default value for Shadow is 0. You can increase or decrease
the shadows in a particular image as needed by adjusting this
scroll bar.
Increasing the shadow value has the net effect of darkening the
dark areas of your image. Decreasing the value has the net effect
of lightening the dark areas of your image.
Midtone
All optical devices such as monitors and scanners have some
differences in their light sensitivity characteristics. 480cx TWAIN
Scanner provides Midtone adjustment for you to compensate for
these differences in your scanner, and it produces better scanned
images.
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