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Adobe® Photoshop® CS2 Studio Techniques by Ben Willmore

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How Sharpening Works

To sharpen an image, choose Filter > Sharpen. Photo-shop will present you with a submenu of choices. The top three might sound friendly (Sharpen, Sharpen More, Sharpen Edges), but ignore those because they are simply presets that enter different numbers into the bottom choice (Unsharp Mask). The bottom two filters in the list are the only ones that allow you to control exactly how much the image will be sharpened. We'll start by exploring the Unsharp Mask filter and then refine our knowledge by exploring Photoshop CS2's new Smart Sharpen filter.

The reason Unsharp Mask has its confusing name is because way back before people used desktop computers, they sharpened images in a photographic darkroom. They would have to go through ...

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