Canon EOS7DBODY 用户手册 (en)

: Setting the White BalanceN
You can set the white balance’s color temperature numerically in Kelvin. 
This is for advanced users.
Select [White balance].
Under the [2] tab, select [White 
], then press <0>.
Set the color temperature.
Turn the <5> dial to select [P].
Turn the <6> dial to set the color 
temperature, then press <0>.
The color temperature can be set 
from 2500K to 10000K in 100K 
 Setting the Color Temperature
If the exposure obtained in step 1 is way off, a correct white balance 
might not be obtained.
If the image was captured while the Picture Style was set to 
[Monochrome] (p.65), it cannot be selected in step 3.
Instead of a white object, an 18% gray card (commercially available) can 
produce a more accurate white balance.
The personal white balance registered with the provided software will be 
registered under <O>. If you do step 3, the data for the registered 
personal white balance will be erased.
When setting the color temperature for an artificial light source, set white 
balance correction (magenta or green) as necessary.
If you want to set <P> to the reading taken with a commercially-
available color temperature meter, take test shots and adjust the setting 
to compensate for the difference between the color temperature meter’s 
reading and the camera’s color temperature reading.