Canon EOS 5D Mark IV L-series Standard Zoom Lens Kit Owner's Manual

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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 the <A> mode, [Standard] is automatically set.
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 the effect of Auto Lighting Optimizer is too strong and the image is too 
bright, set [Low] or [Disable].
 
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].
 
When you set multiple exposures (p.268), HDR mode (p.263), or 
highlight tone priority (p.206), [Auto Lighting Optimizer] will be 
automatically set to [Disable].
In step 2, if you press the <B> button and remove the [X] mark for 
[Disabled in M or B modes] setting, the [Auto Lighting Optimizer] can be 
set even in the <a> and <F> modes.