Canon EOS 77D - Page 172

B: Matching the Light SourceN
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4
Select [O (Custom)].
 Press the <WB> button.
 Select [O (Custom)], then press
<0>.
 If the exposure obtained in step 1 differs greatly from the standard
exposure, a correct white balance may not be obtained.
 In step 3, the following images cannot be selected: Images captured with
the Picture Style set to [Monochrome] (p.162), images shot with a
Creative filter, images processed with a Creative filter after shooting,
cropped images, and images shot with another camera.
The personal white balance registered with EOS Utility (EOS software,
p.488) will be registered under [O]. If you perform step 3, the data for the
registered personal white balance will be erased.