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Real World Adobe Photoshop CS3: Industrial-Strength Production Techniques by Bruce Fraser, Conrad Chavez, David Blatner

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Chapter 2. Image Essentials: It’s All Zeroes and Ones

Computers know nothing about images, or tone, color, truth, beauty, or art. They’re just very complicated adding machines that crunch numbers. Every piece of data we store on a computer is comprised of numbers. All the commands we send to the computer are translated into numbers. Even this text we wrote is made up of numbers.

Fortunately, you don’t have to learn hexadecimal or binary math to use Photoshop—we authors are living math-challenged proof of that. But if you want to put Photoshop under your control, rather than flailing around and occasionally getting good results by happy accident, you do need to understand the basic concepts that Photoshop and other image editors use to represent ...

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