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.
Have an image that needs an absolute color overhaul? This video shows you how to apply some shockingly massive edits, get great results, and clean up the histogram so it looks like you never set foot in Photoshop.
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