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3.15. Blur/Sharpen
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GIMP - “Smart” Sharpening
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I made a new Gimp plugin that sharpens images with many different algorithms. It is like Gimp's "High pass" filter but with many more options. IMO, Median Sharpen is best. Follow simple
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How to sharpen an image in GIMP?
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How To Sharpen An Image In GIMP - Quick And Easy Method