Microtek ScanMaker 6100 Pro User Manual page 97

4. Select a mask size in the Mask Size box. This parameter
determines the depth of pixels that will be affected at the
edge. Available selections are 3x3, 5x5, 7x7, 9x9, 11x11, and
13x13. For small, low-resolution image files, 3x3 is sufficient.
For high-resolution, or large-scale image files, use 7x7.
5. Enter a value in the Threshold box. This option allows you to
specify a tolerance range to prevent overall sharpening that
might generate noise or cause other unexpected results. The
Threshold defines the required image of contrast between
adjacent pixels before sharpening is applied to an edge. A
lower value produces a clearer effect.
6. The Light and Dark option control the sharpness effect to be
applied to the light and dark edges of the images, respectively.
In general, doing too much Unsharp Masking on light edges
would make images seem unnatural, as the human eye is
sensitive in perceiving changes in bright areas of the image
beyond a certain threshold. If both values are 0, Unsharp
Masking effect is disabled.
7. Click OK to apply the settings.