SIGMA DP3 Quattro - Manual (Page 66)

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Light source can be reddish or bluish, the color of light described as
absolute temperature (K: Kelvin) is called “Color Temperature”. The
lower the color temperature is, the more reddish the color of light turns
out, and the higher, the more blueish. Please refer P.62 for the
approximate color temperature of the light source.
SETTING A CUSTOM WHITE BALANCE
For more precise control of the white balance setting or when
photographing under unusual lighting conditions, the " Set Custom WB"
option can be used to capture a sample of neutral object in a scene to be
used for color correction.
1
To capture a custom white balance image, please select [ Capture
Settings] (P.27) → [White Balance] → [Custom ], then press the
button. (When the button is pressed after selecting [ Custom ], the
current white balance setting will be set.)
When a custom white balance is set in the Quick Set menu (P.35), select
[ ] and press the button to display the custom white balance setting
screen (By pressing the button or the shutter button halfway after
selecting [ ], the current setting will be applied.).
2
Under the lighting conditions that will be used for the final photograph,
frame a white color object, such as a sheet of white paper or a white wall,
so that it fills the frame in the center of the color LCD monitor, and then
press the shutter button.
If a valid white balance settings was captured, a message “ White balance
image captured successfully” will appear on the color LCD monitor that
the white balance image was captured successfully.
If the capture was not successful, “ Failed ! Please retry the custom WB
capture.” will be displayed on the color LCD monitor.
Press the shutter button to capture a white balance image once again.
To dismiss the capture, press the button.