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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 10. Sharpness, Detail, and Noise Reduction: Getting an Edge on Your Image

The human visual system depends to a great degree on recognizing edges. Our eyes pass information to our brain, where every detail is quickly broken down into “edge” or “not edge.” (Thousands of years of evolution have developed our brains to ignore most of what’s going on in our field of vision and instead focus immediately on moving edges that might turn out to be a hungry tiger.) An image may have great contrast and color balance, but without good edge definition, we simply see it as less lifelike.

No matter how good your camera or scanner and how crisp your original may be, you always lose some sharpness when an image is digitized. Images from scanners and digital ...

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