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Photoshop Top 40, Feature #9: Levels

The Levels command, and its cohort the histogram, let you adjust luminance levels on a channel-by-channel basis. The upshot is that you can increase contrast, correct for color cast, and make a bad image good.

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Photoshop Top 40, Feature #26: Dodge and Burn

Photoshop offers two tools that paint with luminance: The dodge tool paints in brightness, the burn tool paints in darkness. They're crazy useful, and they've gotten so much better in Photoshop CS4.

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