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Chapter 7. Black & White: Photoshop in B... > Calculations Method - Pg. 196

The Photoshop CS2 Book for Digital Photographers Calculations Method If there's one dialog in Photoshop that scares the living daylights out of people, it's the Calculations dialog. It's got an awfully intimidating layout for a dialog that simply lets you combine two channels, but that's part of the beauty of it--once you learn this technique, you can "name drop" it to impress other Photoshop users. So the next time you're at a Photoshop party and Deke McClelland strolls by, just casually mention something like: "I was converting this grayscale image using Calculations the other day..." and then see if he offers to buy you a Heineken. Step One: Open the color photo that you want to convert to grayscale using Calculations. Go under the Image menu and choose Calculations to bring up the Calculations dialog. Basically, what you're going to do