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Chapter 8. Modern Problems: Dealing with... > Dealing with Digital Noise - Pg. 209

The Photoshop CS2 Book for Digital Photographers Step Three: This filter seems to work best if you crank up the Strength fairly high (try 7 or 8). You want to find a sweet spot for keeping as much detail as possible, while still getting decent noise reduction, so try setting the Preserve Details slider between 40% and 50%. You want to really work the Reduce Color Noise slider (start between 60% to 70%, and then drag to the right for more reduction but without making the photo noticeably blurry). For Sharpen Details, keep that at no more than 15% to 20% (you'll probably get better results if you use the Smart Sharpen filter next, rather than applying the sharpening here). Click OK to reduce the color noise.