Canon 650D - Manual (Page 123)

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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 done when the image is captured. For RAW
images, it can be corrected with Digital Photo Professional (provided
software, p.350).
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
Under [54: Custom Functions (C.Fn)], if [3: Highlight tone priority] is
set to [1: Enable], the Auto Lighting Optimizer will be set automatically to
[Disable] and the setting cannot be changed.
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].
Depending on the shooting conditions, noise may increase.
In step 2, if you press the button and uncheck the [Disable
during man expo] setting, the Auto Lighting Optimizer can be set in the
mode.
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