Enhances the sharpness or focus by selectively increasing the contrast between adjacent pixels along edges in an image.

Filter.

To select a preset, pick one from the Presets tab.

Determines how much contrast is added at the edges.

Controls the size of the edges you wish to sharpen.

The threshold setting is used to sharpen more pronounced edges, while leaving more subtle edges untouched. Low values sharpen more image areas while higher threshold values sharpen less.