Microtek 35t plus User Guide

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.

To use Unsharp Mask:

     Choose 

Unsharp Mask

 from the Filters menu. The Unsharp Mask dialog box

appears.

     Enter a value in the 

Amount

 box to specify the percentage of the filter's effect. The

higher the percentage, the stronger the effect of the filter.

     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.

     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.