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Unsharp mask-tutorial
The Unsharp Mask filter corrects the softness often visable in digital photos. It also corrects blurring that occurs when an image is reduced in size.
An unsharp mask filter is found in most intermediate and advanced image editing programs. This tutorial is illustrated using Photoshop. Click on the image below for a larger view of the Unsharp Mask options.
Begin by opening an image then selecting the menu and sub menus Filter > Sharpen > Unsharp Mask.
Check Preview so you can watch changes take place the sliders are adjusted.
The Amount Slider increases the contrast of image pixels.
The Radius Slider determines the number of pixels near edge pixels that are influenced by the amount of sharpening.
The Threshold slider is used to prevent introducing noise.
The degree of sharpness depends on the settings used. Programs such as Photoshop also let you "fade" the effect to reduce the overall sharpness. Experiment a bit until you are satisfied with the degree of sharpening.
The results of using Unsharp Mask filter are more pronounced when preparing an image for online viewing. You may need to use different settings when preparing an image for print.
