Unsharp Mask

The Unsharp Mask sharpens the image by removing blurred features of the image. The degree of enhancement ranges from 0% (no sharpening) to 100% (maximum sharpening) as controlled by two properties: The Sigma property determines the size of blurred details to remove. The Blending property determines the proportion of de-blurred image mixed with the original image. In general, the stronger the enhancement, the greater the increase in sharpness but also the greater the appearance of ringing artifacts surrounding sharp features. This filter is slower than the High Pass Filter but generally gives superior results by adding less noise to the final image.

The Unsharp Mask command opens from the Image Window > Process > Filters menu and button on the Main Toolbar. The "immediate" form, shown first, opens when an image or image set is displayed in the top-most window. The general form can be used to select source images from folders, windows, or by matching templates.

Unsharp Mask Properties

Profile [\|>]	Selects the parameter profile for this command and allows you to save or work with existing presets.
[Select]	Opens the Select Source Images dialog to choose images from an image window, folder, files, name template, or a Mira File List.
Sigma	Specifies the sigma value of a Gaussian to calculate the blurred version of the original image.
Blending	Controls the percentage of de-blurred image blended with the original image to produce the final image.
Source Region	Specifies the rectangular region to be processed. The options are as follows: Entire image: The entire image is processed. Image Cursor: The region to be processed is selected using the Image Cursor. Rectangle: The region specified by Min andMax limits for Column and Row coordinates is processed. Column and Row, Min and Max: When Rectangle is selected, these values specify the column and row limits to be processed.

Related Topics