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Real World Digital Photography, 2nd edition by Tim Grey, Seán Duggan, Katrin Eismann

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Sharpening

Just as all digital images need spotting to touch up dust specks or other tiny imperfections, all digital images also need sharpening. The act of taking a scene from the real world and translating it into a mosaic of millions of tiny, square pixels will inevitably introduce some softening into an image. Images from high quality digital cameras typically are sharper than scans, but even they can often be greatly improved with some sharpening applied (Figure 11.1). Many cameras deal with this by applying a sharpening pass as the image is processed after the initial capture. Because sharpening permanently alters the contrast and color of pixels, and because you have little control over how the camera applies the sharpening, we recommend ...

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