Canon EOS 30D Instruction Manual

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Normally, the <Q> setting will set the optimum white balance 
automatically. If natural-looking colors cannot be obtained with <Q>, 
you can set the white balance manually to suit the respective light source. 
In the Basic Zone modes, <Q> will be set automatically.
1
Press the <E> button.
 (9)
2
Select the white balance setting.
 
While looking at the top LCD panel, 
turn the <5> dial.
* Set the optimum white balance manually to suit the lighting. (p.65)
The three RGB (red, green, and blue) primary colors exist in the light source in 
varying proportions depending on the color temperature. When the color 
temperature is high, there is more blue. And when the color temperature is low, 
there is more red. To the human eye, a white object looks white regardless of 
the type of lighting. With a digital camera, the color temperature can be adjusted 
with software so that the colors in the image look more natural. The subject’s 
white color is used as the criteria for adjusting the other colors. The camera’s 
<Q> setting uses the CMOS sensor for auto white balance.
B
 Setting the White BalanceN
Display
Mode
Color temperature (Approx. K: Kelvin)
Q
Auto
3000 - 7000
W
Daylight
5200
E
Shade
7000
R
Cloudy, twilight, sunset
6000
Y
Tungsten
3200
U
White fluorescent light
4000
I
Flash
6000
O
Custom*
2000 - 10000
P
Color temperature
2800 - 10000
About White Balance