Canon EOS 80D - Manual (Page 165)

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3 Setting the White BalanceN
4
Select [White balance].
 Under the [z2] tab, select [White
balance], then press <0>.
5
Select the custom white balance.
 Select [
O
], 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], images shot with a Creative filter,
images processed with a Creative filter after shooting, multiple-exposure
images, cropped images, and images shot with another camera.
 Instead of a white object, a gray chart or 18% gray reflector
(commercially-available) can produce a more accurate white balance.
 The personal white balance registered with EOS Utility (EOS software)
will be registered under [O]. If you perform step 3, the data for the
registered personal white balance will be erased.