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enhances the contrast of small-scale detail by a factor of 9. Its effect can be dramatic, as if a layer of mushy "fog" covering the source image were suddenly removed. The filter's operation is difficult to grasp at first sight. It is useful to envision the filter as consisting of two components, using its linearity property, thus:

Sharpening seen as the sum of the local difference plus the original image.

Sharpening seen as the sum of the local difference plus the original image.

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