Canon EOS 60D - Manual (Page 217)

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You can adjust the brightness of the LCD monitor to make it easier to
read.
1
Select [LCD brightness].
Under the [6] tab, select [LCD
brightness], then press <0>.
2
Adjust the brightness.
While referring to the gray chart,
press the <U> key to adjust the
brightness, then press <0>.
Changing Image Playback Settings
3 Adjusting the LCD Monitor Brightness
To check the image’s exposure, looking at the histogram is recommended
(p.193).