Canon MARK IV User Manual (en)

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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. Setting information is 
appended to RAW images and automatic correction is possible with 
Digital Photo Professional (provided software).
By default, [Standard] is set. However, with [8C.Fn II -4: Auto 
Lighting Optimizer
], you can adjust the correction amount (p.215).
1
Set [8C.Fn II -4: Auto Lighting 
Optimizer].
 
Set the correction amount.
 
For details on setting a Custom 
Function, see page 204.
2
Take the picture.
 
The image will be recorded with the 
brightness and contrast corrected if 
necessary.
Auto Lighting Optimizer
Sample of corrected brightness
Î
 
If [8C.Fn II -4: Auto Lighting Optimizer] is set to a setting other than 
[3: Disable], the image might still look bright even if manual exposure, 
exposure compensation, or flash exposure compensation has been set 
to make the exposure darker. If you want the darker exposure, set the 
Auto Lighting Optimizer to [3: Disable] first (p.215).
 
Depending on the shooting conditions, noise might increase.
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