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<blockquote data-quote="WayneF" data-source="post: 405626" data-attributes="member: 12496"><p>Right, excessive USM sharpening can cause a halo around edges. At a contrast edge, USM makes the bright side brighter, and the dark side darker, emphasizing the edge. Same technique was used in paintings in the 1500s (dark or white lines along edges, etc). The name USM (UnSharp Mask) is from film use, when the negative was sandwiched in the enlarger with a second but blurred negative copy (which is positive), which distorted the sharp edges in this way.</p><p></p><p>Radius defines the relative width of the manipulated edge (however it is not dimensioned in pixels), and Amount is the degree of brighter/darker. A small sample is at <a href="http://www.scantips.com/simple6.html" target="_blank">Sharpening with Unsharp Mask</a></p></blockquote><p></p>
[QUOTE="WayneF, post: 405626, member: 12496"] Right, excessive USM sharpening can cause a halo around edges. At a contrast edge, USM makes the bright side brighter, and the dark side darker, emphasizing the edge. Same technique was used in paintings in the 1500s (dark or white lines along edges, etc). The name USM (UnSharp Mask) is from film use, when the negative was sandwiched in the enlarger with a second but blurred negative copy (which is positive), which distorted the sharp edges in this way. Radius defines the relative width of the manipulated edge (however it is not dimensioned in pixels), and Amount is the degree of brighter/darker. A small sample is at [URL="http://www.scantips.com/simple6.html"]Sharpening with Unsharp Mask[/URL] [/QUOTE]
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