Canon EOS Rebel T3 18-55mm IS II Lens Kit - Manual (Page 107)

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If the image comes out dark or the contrast is low, the brightness and
contrast can be corrected automatically. This feature is called Auto
Lighting Optimizer. The default setting is [Standard]. 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, p.270).
1
Select [Auto Lighting Optimizer].
Under the [2] 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 Correcting the Brightness and Contrast AutomaticallyN
Without correction With correction
Under [7 Custom Functions (C.Fn)], if [5: Highlight tone priority] is
set to [1: Enable], the Auto Lighting Optimizer will be set automatically to
[Disable] and you cannot change this setting.
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 a
darker exposure, set [Auto Lighting Optimizer] to [Disable] first.
In Basic Zone modes, [Standard] is set automatically.
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