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Grokking The Gimp
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3.3.6 The Sharpen Function

The concept of a partially selected pixel was introduced in Section  3.1.2, in the discussion on antialiasing, and was extended in Section  3.1.2, in the discussion on feathering. The function Sharpen, from the Image:Select menu, removes partially selected pixels in an image by transforming those that are 50% or more selected into fully selected pixels and by fully deselecting all the remaining pixels. Thus, this function sharpens the active selection (not the image).

Grokking The Gimp
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