Life Hacker
A great tip here from the guys at lifehacker to fix exposure problems really quickly.

http://www.youtube.com/watch?feature=player_embedded&v=UyIHpRjaBic

    • Open up the photo and duplicate the layer containing it.
    • Invert the duplicated layer. (The shortcut is Control/Command+I in Photoshop and is likely the same in other image editors.)
    • Set the duplicated layer's blending mode to Overlay.

  • Optional: Reduce the opacity of the duplicated layer if the effects are too much.
  • Optional: Merge the two layers and adjust the levels or curves to suit your taste. (If you're in Photoshop, you can just make a new adjustment layer to do this.)

 

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