Canon EOS 1300D - Manual (Page 134)

B : Matching the Light SourceN
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Select [O (Custom)].
 Press the <XB> 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.96), images processed with a
Creative filter, or 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,
p.314) will be registered under [O]. If you perform step 3, the data for
the registered personal white balance will be erased.