Epson 600 User Manual page 123

Advanced Scanning
The height of the curve indicates the intensity of the
tone, from darker tones on the left to lighter tones on
the right.
You can adjust any shadow, midtone, or highlight in an
image by changing the shape of its tone curve.
For example, suppose you want to scan a photograph
of a group of people where most of the faces look fine,
but one person was too close to the flash and so looks
washed out.
Since most of the subjects in the photo look fine
(indicating that the midtone ranges are good), you can
adjust only the washed-out area (the highlights) by
decreasing the highlight value of the curve (the right
side).
As another example, suppose you have a photograph
where some objects are too dark and others are too
light (which can happen easily when shooting outside
on a bright, sunny day).
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