Here is an interesting chart for unsharp mask on
Subject Amount Radius Threshold
Soft subjects 150 1 10
Portraits 75 2 3
Moderate sharpening 225 0.5 0
Maximum sharpening 65 4 3
All-purpose sharpening 85 1 4
Source:
For starting values of the USM filter for different uses, try the ones suggested by PhotographyJam:
http://photocritic.org/unsharp-mask-sharpening-photos-photoshop/
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