![]() An unsharp mask is simply a blurred image that is produced by spatially filtering the specimen image with a Gaussian low-pass filter. The unsharp mask filter algorithm involves subtraction of an unsharp mask from the specimen image. How does the unsharp mask filter algorithm work? The unsharp mask is then combined with the positive. The "unsharp" of the name derives from the fact that the technique uses a blurred, or "unsharp", negative image to create a mask of the original image. Unsharp masking ( USM) is an image sharpening technique, often available in digital image processing software. Seashore is based on GIMP technology and uses the same file format. It looks a little outdated, but it has all basic photo editing features. It has cool features such as layer support and pressure sensitivity, while the interface will appeal to both experienced users and beginners. ![]() How is unsharp masking used in image sharpening? Seashore is a good GIMP alternative for Macs. Another complication of using an unsharp mask is that it can introduce subtle color shifts. Alternatively, one could employ one of the more advanced sharpening techniques (coming soon). Remedies: The appearance of halos can be greatly reduced by using a smaller radius value for the unsharp mask. Are there any remedies for using an unsharp mask? It can be accessed in Adobe Photoshop by clicking on the following drop-down menus: Filter > Sharpen > Unsharp Mask.
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