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Custom Unsharp Mask effect The unsharp mask effect increases the contrast between colors that define an edge. The radius bar defines the distance from the edge at which pixels are adjusted for contrast. If you specify a low value, only pixels near the edge are adjusted. Threshold defines the greatest difference between adjacent pixels for which contrast isn’t adjusted. Amount bar defines how much effect is applied.
Hint: When you applied an effect to a picture, you can directly compare the original picture with the edited one. For further information go here.
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