Xerox WorkCentre 480cx User Manual page 202

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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.
To change the Midtone value, move the Slider to the left or right to change
the values in the adjacent text box. The value in the adjacent box will
change in the range 0.1 to 10.0 as the slider moves.
6-24 Scanning