Chapter 6. How Software Manipulates Pixels
The numbers racket rarely pays off as well as it does in retouching photos—digital photos, that is. For when you’ve shot or scanned a photograph, all those areas of color and light and dark can be assigned a number, several numbers, in fact, for color, position, and hierarchy. Then you’re only a calculator away from improving that picture for an off-color hue here, a touch of red–eye there, or (on the more drastic side) getting rid of irritating relatives entirely.
Practically any operation that can be carried out with photo-editing software starts with the number of some pixel in the photo. If you want ...
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