Canon POWERSHOT A300 User Manual page 62

@ To set and use a custom white balance
setting, it is advisable to select the []
shooting mode and set the exposure
compensation to zero (lril). The correct
white balance may not be obtained when
the exposure is incorrect (image is
completely black or white).
@ Since the white balance data cannot be
read in _ and m modes, preset the white
balance in another shooting mode.
@ Set the flash on or off when setting a
custom white balance. The white balance
may not be accurate if the setting conditions
and shooting conditions are not the same. If
the flash fires when setting a custom white
balance with the flash set to [] or [_J_,
ensure that you also use the flash when you
go to shoot.
@ The custom white balance setting is not
cancelled even if settings are reset to
default settings. (p. 112)