"Effect: Unsharp Mask" dialog box

Used to enhance precision by emphasizing the outline of the image.

[Strength] slider

Used to specify the degree of lightness and darkness in the picture within a range of 1 to 100.

[Radius] slider

Used to specify the area for which Unsharp Mask is applied within a range of 1 to 10 pixels.

[Threshold] slider

Used to specify the degree of the border effect within a range of 0 to 100.