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Chapter 13. Look Sharp: Sharpening Techniques > Basic Sharpening - Pg. 373

The Photoshop CS2 Book for Digital Photographers Threshold A pretty safe range for the Threshold setting is anywhere from 3 to around 20 (3 being the most intense, 20 being much more subtle. I know, shouldn't 3 be more subtle and 20 more intense? Don't get me started). If you really need to increase the intensity of your sharpening, you can lower the Threshold to 0, but keep a good eye on what you're doing (watch for noise appearing in your photo).