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Chapter 7. Black & White: Photoshop in B... > Using the Lightness Channel - Pg. 187

The Photoshop CS2 Book for Digital Photographers Step Three: Go to the Channels palette (found under the Window menu), and you'll see that your photo is no longer made up of a Red, a Green, and a Blue channel. Instead, the luminosity (the Lightness channel) has been separated from the color data, which now resides in two channels named "a" and "b." Regular RGB image Converted to Lab Color Step Four: We're interested in the grayscale image that appears in the Lightness channel, so click on the Lightness channel in the Channels palette to make it active. Your photo will now look grayscale onscreen too, as it displays the currently active channel. Continued Photoshop in Black and White Chapter 7 187