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Chapter 13. Look Sharp: Sharpening Techniques > Lab Color Sharpening - Pg. 375

The Photoshop CS2 Book for Digital Photographers Step Three: By switching to Lab Color, you've sepa- rated the detail (Lightness channel) from the color info (the a and b channels), so click on the Lightness channel to select it. Now you'll go to the Filter menu, choose Sharpen, and apply the Unsharp Mask filter to just this black-and-white Lightness channel, thereby avoiding the color halos, because you're not sharpen- ing the color (pretty tricky, eh?). Note: If you need some settings for using Unsharp Mask, look in the previous tuto- rial called "Basic Sharpening"; however, I recommend these settings: Amount 85%, Radius 1 pixel, and Threshold 4. Step Four: Once you've sharpened the Lightness channel, you may want to apply the sharpening again by pressing the keyboard shortcut Command-F (PC: Control-F) for a crisper look. Then, go under the Image menu, under Mode, and choose RGB Color to switch your photo back to RGB. Now, should you apply this brand of sharpening to every digital cam- era photo you take? I would. In fact, I do, and since I perform this function quite often, I automate the process (as you'll see in the next step). Continued Sharpening Techniques Chapter 13 375