Canon PowerShot Pro 90 IS Software Starter Manual page 70

• To set and use a custom white balance setting, it is advisable to select the
shooting mode and set the exposure compensation and flash exposure
compensation to zero ( 0). The correct white balance may not be obtained when
the exposure is incorrect (image is completely black or white).
• It is also desirable to zoom in to the maximum telephoto setting.
• Since a custom white balance setting cannot be set in
balance in another shooting mode first before selecting the
• If the flash fires when setting a custom white balance with the flash set to auto or
red-eye-reduction auto, use the flash when you go to shoot too. The correct white
balance cannot be obtained unless the flash is used consistently. To ensure
consistency, set the flash to on or off as appropriate.
• The selected shooting mode will determine whether or not the custom white
balance setting is cancelled when the camera is turned off.
68
Shooting - Selecting Particular Effects
mode, pre-set the white
mode.