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The DSLR Field Guide by Michael Freeman

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Advanced Sharpening

When it comes to sharpening, not only is every image unique, but different areas within the same image may well require differing levels of sharpening.

Ultimately, what this means is that to achieve successful sharpening—that is the impression of sharpness but without any artifacts—you need to apply selective sharpening. The Threshold control shown on the previous pages is the standard means of applying selectivity, but there are others. Typically, the most sharpening is wanted along edges and in areas of fine detail, and the least (indeed, often none) is wanted in smooth areas and especially in zones that are out of focus. An important caveat is that some areas may have such intensity of detail that they react badly to sharpening—brightly ...

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