Canon EOS Rebel XT - Manual (Page 56)

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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 <
X X X XB> button.
s The [White balance] menu will
appear.
2 Select the white balance setting.
¡ Press the <
S> key to select the
desired setting, then press <
0>.
¡ When you press the shutter button
halfway, the white balance setting will
be displayed on the LCD panel.
* Set the optimum white balance manually to suit the lighting. (p.57)
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 image sensor for auto white balance.
B Setting the White BalanceN
Display Mode Color temperature (Approx. K)
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
About White Balance