Unsharp Masking (USM) Any
one of three different processes that can be used to sharpen image details
using photographic, optical or digital methods. Digital USM, completed
after a film image is scanned, allows the amount of sharpening to be
varied by the operator. USM is routinely applied to scanned images since
the nature of the scanning process decreases image sharpness.
© Lloyd Godman
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