Sams Teach Yourself Adobe Photoshop CS4 in 24 Hours

Chapter 15. Applying Filters to Improve Your Picture

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Sharpen Filters

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Blur Filters

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Noise Filters

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When you get right down to it, Photoshop is really all about math. That’s right—I know some of you don’t want to hear it, but it’s true. All the actions that you can perform on an image in Photoshop rely on complex calculations of pixel color and position with respect to other variables that you specify. That’s why we let the computer do the heavy lifting, but it’s also why there are so many filters for you to play with. Each filter is a combination of changes to your image based on its underlying numbers, and since ...