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Unsharp Masking

unsharp masking (often abbreviated as USM) may sound like the last thing you'd want to do if you're trying to make an image appear sharper, but the term actually makes some sense; it has its origins in a traditional photographic technique for enhancing sharpness.

The things we see as edges are areas of high contrast between adjacent pixels. The higher the contrast, the sharper the edges appear. So to increase sharpness, you need to increase the contrast along the edges.


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