Smart Sharpen does take a bit more time to work its magic for the complicated math it uses, but it's a pretty brilliant tool and one of hundreds of reasons Photoshop has no real competition right now.

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Radeon Image Sharpening is a clear improvement on lumasharpen. In some ways, RIS is just as subtle as lumasharpen, for example in the fibers on the sweater on the right. Both look similar.