Unsharp Mask
 
 
 

The Unsharp Mask tool lets you sharpen the edges and other fine details in the input image.

Unsharp masking provides more control on the sharpening process and will generally produce better results than the Laplacian filter, but at a higher computational cost.

Unsharp masking works by removing the low frequency spatial information from the image and emphasizing the high frequency details. The algorithm basically uses a Gaussian filter to produce a smooth version of the original image, called unsharp mask. The unsharp mask is then subtracted from the original image, removing low frequencies.

The Unsharp Mask tool has the following parameters:

NoteThis tool can either affect the RGB components or the Alpha component, but not both at the same time.