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Of all the tools available in digital image processing none causes more confusion than the use ofUnsharp Masking. I believe that this is in large measure because users don't understand what each of the three tools,Radius,AmountandThresholdactually does. The mystery is now revealed. By: Dale Cotton Defining Sharpening Sharpening is about restoring accutance that has been lost previously along the image capture chain of events. Accutance = how precisely the edges of things are defined. Fuzzy edges = rub eyes, do I need new glasses? But if the edges have been blurred during digitization how can the lost detail that defined the edges be recovered? It can't be; the first law of computing is garba...

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Michael Reichmann is the founder of the Luminous Landscape. Michael passed away in May 2016. Since its inception in 1999 LuLa has become the world's largest site devoted to the art, craft, and technology of photography. Each month more than one million people from every country on the globe visit LuLa.
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