Unsharp Masking - Microtek ScanMaker IIG User Manual

Unsharp Masking

The Unsharp Masking 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.
To use Unsharp Masking:
Choose Unsharp Masking from the Filters menu. The
1
Unsharp Mask dialog box appears.
Enter a value in the Amount box to specify the percentage
2
of the filter's effect. The higher the percentage, the
stronger the effect of the filter.
3 Enter the Radius value in pixels. The radius determines
the depth of pixels that will be affected at the edge.
• With a high value, more of the pixels surrounding the
edge pixels are sharpened.
• With a low value, only the edges are sharpened.
4 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 range of contrast
between adjacent pixels before sharpening is applied to
an edge. A lower value produces a more pronounced
effect.
Reference: The Settings Window 5-75