On Apr 2, 2009, at 4:57 PM, Larry Colen wrote:

One thing that I haven't been able to find yet is a good description
of the mechanism of sharpening, unsharp mask and what all the various
knobs, dials and variables do.

An excellent 16 minute video presentation of Lightroom's 'Sharpening and Noise Reduction' controls is available on the Adobe website:

http://www.adobe.com/designcenter/video_workshop/?id=vid0292

Godfrey

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