This link has been bookmarked by 47 people . It was first bookmarked on 25 Oct 2006, by Thomas Hodder.
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04 Aug 16
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The sharpening process works by utilizing a slightly blurred version of the original image. This is then subtracted away from the original to detect the presence of edges, creating the unsharp mask (effectively a high-pass filter). Contrast is then selectively increased along these edges using this mask — leaving behind a sharper final image.
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Note: Unsharp masks are not new to photography. They were traditionally performed with film
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The human eye sees what are called "Mach bands" at the edges of sharp transitions, named after their discovery by physicist Ernst Mach in the 1860's.
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Note how the brightness within each step of the gradient does not appear constant. On the right side of each step you will notice it is lighter, whereas on the left it is darker — very similar to the behavior of an unsharp mask. Move your mouse over the plot below to see what is happening:
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Unsharp masks are wonderful at sharpening images, however too much sharpening can also introduce "halo artifacts."
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25 Jun 14
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09 Oct 12
Ady GouldAn "unsharp mask" is actually used to sharpen an image, contrary to what its name might lead you to believe. Sharpening can help you emphasize texture and detail, and is critical when post-processing most digital images. Unsharp masks are probably the most common type of sharpening, and can be performed with nearly any image editing software (such as Photoshop). An unsharp mask cannot create additional detail, but it can greatly enhance the appearance of detail by increasing small-scale acutance.
technique unsharp tutorial sharpening photoshop photography #delicious
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Frederik Van ZandeAn "unsharp mask" is actually used to sharpen an image, contrary to what its name might lead you to believe. Sharpening can help you emphasize texture and detail, and is critical when post-processing most digital images. Unsharp masks are probably the most common type of sharpening, and can be performed with nearly any image editing software (such as Photoshop). An unsharp mask cannot create additional detail, but it can greatly enhance the appearance of detail by increasing small-scale acutance.
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pvav pvavAn "unsharp mask" is actually used to sharpen an image, contrary to what its name might lead you to believe. Sharpening can help you emphasize texture and detail, and is critical when post-processing most digital images. Unsharp masks are probably the mos
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