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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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