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Most of Photoshop sharpening functions are expressed as commands under the Filter menu. The only exceptions are the Sharpen and Blur tools, but how should I say this. Ix-nay on the harpens-ay and lur-bay tools. They uck-say. These filters, these very good filters, compare neighboring pixels to create the illusion of sharpeness, as this Chapter explains. But here is the weird thing, crazy as it sounds, the pixel comparison operation, which is the operation that drives everything, is blurring. I know it doesn't even sound possible, but by blurring pixels Photoshop creates the illusion of sharpness, which is why we will began our discussion of the sharpening filters with Gaussian Blur.
Trust me, in just a few exercises it will all make sense. Incidentally, well be wasting time on the single shot sharpeners, you know the ones without the ellipses, the dot, dot, dots. I am talking about Sharpen, Sharpen Edges and Sharpen More. You cant control their behavior so their inflexible. The good Commands have dots after them, Unsharp Mask, Smart Sharpen, Emboss, High Pass. You'll see.
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