Chapter Two. Image Essentials
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 consists 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 Adobe Photoshop and other image editors use to represent photographs using numbers. ...
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