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This next chapter is about one of the worst things on earth, Noise. If you've ever talked on a cell phone or looked up a map on a mobile device, or listened to a car radio, or really done anything in a car, then you know noise. It's the hiccup, it's the lurch, it's the adjectives that don't contribute to the message. It's the extra sentences that I don't need to be saying now. Simply put noise annoys. In the world of digital photography, noise is the visual equivalent of static, random fluctuations between neighboring pixels that don't accurately represent the scene as it was captured.
See this, this is smooth detail and this is noisy detail. And as you open the ISO or push the depth of field or do anything fun and interesting, the noise just gets bigger. Fortunately Photoshop has ways to defeat noise, and it does so by dividing noise into two categories, Luminance and Color. Luminance Noise is random variations in Brightness. Color Noise is random variations in Hue and Saturation. I start this chapter by showing you how to smooth away Noise.
Then I show you how to sharpen the details that are left over. And then I show you how you can use noise to great special effects. After all, noise isn't always bad. Thanks to noise, we have grit, we have feeling, we have texture. Let me show you how to master noise and you can use it anyway you want.
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