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Chapter 7. Black & White: Photoshop in B... > Using the Lightness Channel - Pg. 188

The Photoshop CS2 Book for Digital Photographers Step Five: Now, go under the Image menu, under Mode, and choose Grayscale. Photoshop will ask if you want to discard the other channels. Click OK. If you look in the Channels palette, you'll now see only a Gray channel.