Image Key - Xerox DocuColor 5252 Operator's Manual

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Image key

Some scanners, especially low-end desktop models, tend to
compress the tonal range of an image and increase the contrast or
difference between light and dark areas. If the contrast of your
original is too high or too low, detail could be lost when it is
reproduced. Images that have few dark areas or shadow tones
are called high key. In contrast, a low key image consists of large
areas of shadow and darker midtones (the tones that fall in
between).
Some scanners allow you to manually override automatic
exposure controls in those cases in which the images have these
characteristics.
Imaging software applications use histograms or graphic displays
to show the distribution of pixels inside the different tonal ranges
of an image.
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