Panasonic AW-RP555L Mode D'emploi page 33

Operation
Automatic tracing white balance (ATW)
When the WHITE BAL ATW button is pressed during shooting, the ATW button's lamp
comes on, compensation is provided so that the white balance will be automatically
adjusted even if the light source or colour temperature has changed in order to minimize an
unnatural appearance in the resulting images.
If nothing white is shown on the screen, it may not be possible for the white balance to
be compensated properly.
Similarly, with some light sources or colour temperatures, it may not be possible for the
white balance to be compensated properly.
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