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The thing with layer masks is to blur them. This provides a improved transition between the sharpening or noise reduced regions depending on what the goal of the mask is. What may people forget is that a mask is simply another image. You can highlight the mask (Alt + left mouse button) to activate it. Then you can perform processing functions on the mask itself - this provides remarkable flexibility. Technically you could sharpen a sharpen layer mask if you wanted too. What is important is to understand the effect its having on the data. You can also drop the opacity of a mask so the effect is more subtle. Endless possibilities.
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