Microtek ScanMaker i700 User Manual page 72

Filters
Before
Unsharp Mask filter
The Unsharp Mask filter adjusts the contrast of edge detail and
creates the illusion of more image sharpness. This filter can be useful
for refocusing an image that has become blurry from interpolation or
scanning. You can choose the predefined Unsharp Mask filters in the
Setting window for use, or customize the Unsharp Mask filters by
yourself.
The dialog box below appears when you choose Unsharp Mask from
the Filter menu to customize.
The Mask Size determines the depth of surrounding pixels that will
be affected. The larger the mask size, the stronger the sharpening
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After (Sharpen High)