• Pro Sharpening in Photoshop CS3 using Smart Filters | Veerle's blog
  Apply Unsharp Mask Filter Go to the Filter menu and choose Sharpen > Unsharp Mask.... Here is a rule of thumb I learned from Scott Kelby's book 'The Digital Photography Book' (Volume 1): * For people : Amount 150%, Radius 1, Threshold 10 * For cityscapes, urban photography or travel : Amount 65%, Radius 3, Threshold 2 * For general everyday use : Amount 85%, Radius 1, Threshold 4
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• Unsharp Mask Quick Tips - Lonestardigital.com
  
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