The Brightness control can be mistaken for an exposure control; actually, all it adjusts is how bright the colors (in particular, the midtone values) are in your image. Moving the Brightness slider to the right lightens the midtones; moving it leftward darkens the midtone areas.
Figure 9-17 shows the Brightness adjusted to a value of 43. The Auto Adjustment for this image actually set the Brightness value at 53, but because I like my skies a little dark (especially blue skies!), I turned the Brightness slider down to the left to give me that darker sky without sacrificing too much highlight in the buildings.
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