Blur & Sharpen > Unsharp Mask effect

The Unsharp Mask effect increases the contrast between colors that define an edge. Use the Radius control to specify the depth of pixels that will be affected at an edge. If you specify a high value, more of the pixels surrounding the edge are adjusted for contrast. If you specify a low value, only pixels at the edge are adjusted. Use the Threshold control to specify a tolerance to define edges and prevent overall contrast adjustment that might generate noise or cause unexpected results. Values define the range of contrast allowed between adjacent pixels before contrast is adjusted. A lower value produces a more pronounced effect.


Original (left) and with Amount set to 80, Radius set to 24, and Threshold set to 8 for the cloud layer (right)