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COLOR
TEMPERATURE
Color temperature-how
it affects white balance adjustment
If the temperature of an object continues to increase, it will eventually begin giving off light. At this time, there is
a fixed relationship
between the object's temperature
and its "light color". The temperature
of the object
radiating the light is expressed in absolute temperature(°K).
This is also known as the color temperature,
which in turn stands for "light color". As color temperature
increases, the light color changes from red to yellow to white to blue.
Clear sky
Slightly overcast
Natural light color temperature
(°K)
_,lcj
S
-"
k"
Cloudy, rainy
Direct sunlight
Timer after
sunrise/
before sunset
2hr.
1hr.
40min.
30 min.
20 min.
Sunrise/Sunset
Color change
Artificial light color temperature (°K)
10,000( ° K)
10,000( ° K)
8,000
i
8,000
7,000
Blue
7,000
6,000
I
6,000
5,000
5,000
4,000
White
4,000
3,500
I
3,500
3,200
3,200
3,000
3,000
Yellow
2,500
2,500
!
red
2,000
2,000
Fluorescent
lamp (daylight)
Fluorescent lamp (cool white)
Fluorescent
lamp (off white)
Studio lamp
Halogen lamp
Tungsten lamp
Candle light
The white balance system is a signal sensing type.
From the image signal through the lens, this system
gets the color temperature
information
and makes
automatic white balance control adjustments constantly.
19
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