Canon EOS 80D - Manual (Page 144)

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If the image comes out dark or the contrast is low, the brightness and
contrast can be corrected automatically. This function is called Auto
Lighting Optimizer. The default setting is [Standard]. With JPEG
images, the correction is applied when the image is captured.
In Basic Zone modes, [Standard] is set automatically.
1
Select [Auto Lighting Optimizer].
 Under the [z2] tab, select [Auto
Lighting Optimizer], then press
<0>.
2
Select the setting.
 Select the desired setting, then press
<0>.
3
Take the picture.
 The image will be recorded with the
brightness and contrast corrected if
necessary.
3
Auto Correction of Brightness and ContrastN
 Depending on the shooting conditions, noise may increase.
 If a setting other than [Disable] is set and you use exposure
compensation or flash exposure compensation to darken the exposure,
the image may still come out bright. If you want a darker exposure, set
this function to [Disable].
 If HDR mode, highlight tone priority (p.147), or multiple-exposure
shooting is set, the Auto Lighting Optimizer will be set automatically to
[Disable].
In step 2, if you press the <B> button and uncheck [X] the [Disabled in
M or B modes] setting, the [Auto Lighting Optimizer] can also be set in
the <a> and <F> modes.