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Photoshop® CS3 Bible by Robert C. Fuller, Laurie Ulrich Fuller

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Chapter 3. Image Management

The colored pixels that make up an image work much like the tiles in a mosaic. When you view a mosaic up close, you may not be able to tell what the overall image is supposed to be — move far enough away, however, and the mosaic's tiles blend together to make a complete image. If you enlarge the pixels in an image in Photoshop, they look like an unrelated collection of colored squares. Reduce the size of the pixels, and they blend together to form an image that looks like a standard photograph. Photoshop deceives the eye, counting on the distance that printing or normal onscreen viewing puts between the person's eye and the image pixels, and in most cases, the deception works quite well.

Of course, there are differences between pixels and mosaic tiles. Pixels come in 16 million distinct colors. Also, you can resample, color separate, and crop electronic images, often working at a very zoomed-in, you-can-see-the-individual-pixels ...

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