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White balance (WB) is the process of removing unrealistic color casts,
so that objects which appear white in person are rendered white in your
photo. Proper camera white balance has to take into account the "color
temperature" of a light source, which refers to the relative warmth or
coolness of white light. Our eyes are very good at judging what is white
under different light sources, but digital cameras often have great
difficulty with auto white balance (AWB) — and can create unsightly
blue, orange, or even green color casts. Understanding digital white
balance can help you avoid these color casts, thereby improving your
photos under a wider range of lighting conditions.
BACKGROUND: COLOR TEMPERATURE
Color temperature describes the spectrum of light which is radiated
from a "black body" with that surface temperature. A black body is an
object which absorbs all incident light — neither reflecting it nor
allowing it to pass through. A rough analogue of black body radiation in
our day to day experience might be in heating a metal or stone: these
are said to become "red hot" when they attain one temperature, and then
"white hot" for even higher temperatures. Similarly, black bodies at
different temperatures also have varying color temperatures of "white
light." Despite its name, light which may appear white does not
necessarily contain an even distribution of colors across the visible
spectrum:
Note how 5000 K produces roughly neutral light, whereas 3000 K and
9000 K produce light spectrums which shift to contain more orange and
blue wavelengths, respectively. As the color temperature rises, the
color distribution becomes cooler. This may not seem intuitive, but
results from the fact that shorter wavelengths contain light of higher
energy.
Why is color temperature a useful description of light for
photographers, if they never deal with true blackbodies? Fortunately,
light sources such as daylight and tungsten bulbs closely mimic the
distribution of light created by blackbodies, although others such as
fluorescent and most commercial lighting depart from blackbodies
significantly. Since photographers never use the term color temperature
to refer to a true blackbody light source, the term is implied to be a
"correlated color temperature" with a similarly colored blackbody. The
following table is a rule-of-thumb guide to the correlated color
temperature of some common light sources:
| Color Temperature |
Light Source |
| 1000-2000 K |
Candlelight |
| 2500-3500 K |
Tungsten Bulb (household variety) |
| 3000-4000 K |
Sunrise/Sunset (clear sky) |
| 4000-5000 K |
Fluorescent Lamps |
| 5000-5500 K |
Electronic Flash |
| 5000-6500 K |
Daylight with Clear Sky (sun overhead) |
| 6500-8000 K |
Moderately Overcast Sky |
| 9000-10000 K |
Shade or Heavily Overcast S |
IN PRACTICE
Since some light sources do not resemble blackbody radiators, white
balance uses a second variable in addition to color temperature: the
green-magenta shift. Adjusting the green-magenta shift is often
unnecessary under ordinary daylight, however fluorescent and other
artificial lighting may require significant green-magenta adjustments to
the WB.
The first three white balances allow for a range of color temperatures. Auto
white balance is available in all digital cameras and uses a best
guess algorithm within a limited range — usually between 3000/4000 K and
7000 K. Custom white balance allows you to take a picture of a
known gray reference under the same lighting, and then set that as the
white balance for future photos. With "Kelvin" you can set the color
temperature over a broad range.
The remaining six white balances are listed in order of increasing
color temperature, however many compact cameras do not include a shade
white balance. Some cameras also include a "Fluorescent H" setting,
which is designed to work in newer daylight-calibrated fluorescents.
CUSTOM WHITE BALANCE: CHOOSING A NEUTRAL REFERENCE
A neutral reference is often used for color-critical projects, or for
situations where one anticipates auto white balance will encounter
problems. Neutral references can either be parts of your scene (if
you're lucky), or can be a portable item which you carry with you. Below
is an example of a fortunate reference in an otherwise bluish twilight
scene.
On the other hand, pre-made portable references are almost always more
accurate since one can easily be tricked into thinking an object is
neutral when it is not. Portable references can be expensive and
specifically designed for photography, or may include less expensive
household items. An ideal gray reference is one which reflects all
colors in the spectrum equally, and can consistently do so under a broad
range of color temperatures. An example of a pre-made gray reference is
shown below
IN MIXED LIGHTING
Multiple illuminant with different color temperatures can further complicate performing a white balance. Some lighting situations may not even have a truly "correct" white balance, and will depend upon where color accuracy is most important..Under mixed lighting, auto white balance usually calculates an average color temperature for the entire scene, and then uses this as the white balance. This approach is usually acceptable, however auto white balance tends to exaggerate the difference in color temperature for each light source, as compared with what we perceive with our eyes. Exaggerated differences in color temperature are often most apparent with mixed indoor and natural lighting. Critical images may even require a different white balance for each lighting region. On the other hand, some may prefer to leave the color temperatures as is. Note how the building to the left is quite warm, whereas the sky is somewhat cool. This is because the white balance was set based on the moonlight — bringing out the warm color temperature of the artificial lighting below. White balancing based on the natural light often yields a more realistic photograph. Choose "stone" as the white balance reference and see how the sky becomes unrealistically blue.
