Canon EOS 7D - Manual (Page 77)

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If the image comes out dark or the contrast is low, the brightness and
contrast can be corrected automatically. With JPEG images, the
correction is done when the image is captured. For RAW images, it can
be corrected with Digital Photo Professional (provided software).
The default setting is [Standard].
1
Select [Auto Lighting Optimizer].
Under the [2] tab, select [Auto
Lighting Optimizer], then press
<0>.
2
Set the correction setting.
Turn the <5> dial to select the
setting, then press <0>.
3
Take the picture.
The image will be recorded with the
brightness and contrast corrected if
necessary.
3 Auto Lighting OptimizerN
Sample of corrected brightness
B
Depending on the shooting conditions, noise might increase.
If a setting other than [Disable] is set and you use exposure
compensation, flash exposure compensation, or manual exposure to
darken the exposure, the image might still come out bright. If you want
the darker exposure, set this to [Disable] first.
In fully-automatic modes (1/C), [Standard] will be set automatically.