Pentax K-X - Manual (Page 186)

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You can adjust the white balance depending on the light source when
taking pictures. With the manual white balance, the camera can store
delicate shades that cannot be precisely adjusted with the white balance
preset values provided in the camera. This provides the optimum white
balance for your surroundings.
Adjusting the White Balance Manually
Color Temperature
The color of light shifts towards blue as the color temperature rises,
and towards red as the color temperature falls. Color temperature
describes this change in light color in terms of absolute temperature
(K: Kelvin). This camera is capable of setting the white balance to
enable taking pictures with natural coloring under a variety of lighting
conditions.
2000 3000 4000 5000 6000 8000 10000 12000 [ K ]
Candle flame Oil lamp T
u
ngsten light
Halogen light bulb White (Fluorescent light) Daylight Cloudy Shade Clear sky Daylight (Fluorescent light)
Neutral white (Fluorescent light) Flash
Red tint Blue tint