The Strength specify the degree of the filter's effect here. The higher the
value, the stronger the sharpening effect of the filter. Too much Unsharp
Masking will emphasize the noise in the image.
The Threshold defines the required range of contrast between adjacent
pixels before Unsharp Masking is applied. Only the pixels with the range of
contrast between adjacent pixels before sharpening is applied to an edge.
A lower Threshold value produces a more pronounced effect.
Before After 7x7 After 13x13
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