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The
human eye can easily adapt to different light conditions so
that objects maintain their 'true' colour.
If
we look at a blue ball, for example, we see the same shade
of blue indoors and outdoors and under cloudy or sunny conditions. |
In
fact, each type of light amplifies a certain colour in the spectrum.
What we consider to be 'white' light only occurs during the noon
hours of a clear day. Sunlight in the early evening or late afternoon
gives everything a reddish tint, and cloudy days bring out the blue
end of the spectrum.
Each
type of artificial light also has a particular colour cast. Incandescent
lighting is yellowish and fluorescent lighting can be either blue
or green.
All
of these different lighting
conditions affect the colour balance in photographs.
Most
digital cameras allow you to adjust the colour balance for different
types of light. This can be done manually or automatically, although
the automatic settings can produce uneven results from one picture
to another.
Manual
settings can be done by selecting a preset such as 'sunlight' or
'cloudy', but these settings can be fine-tuned to match very specific
lighting conditions.
Colour
balance is achieved by adjusting the camera so that 'white'
is truly 'white'. Once the camera is set to correctly reproduce
white, the other colours should appear to be their natural shade.
This can be quickly checked by looking through the viewfinder of
your digital camera. Holding up a piece of white paper in front
of the camera will allow you to see whether it is the correct shade
or not.
Some
cameras can be set this way -- place a sheet of white paper in front
of the viewfinder and select 'Auto Correct'.
Remember
that the presets are general guidelines and may not be suitable
for every type of lighting condition. If your camera has a setting
for florescent lights, for example, it may still require further
tweaking to get the correct colour balance.
Although
it is best to try to get the proper colour balance when you are
taking photographs, the colour of an image can also be adjusted
using software. This should not be thought of as an alternative
to proper colour balancing, but it can be used to good effect on
some digital images.
Some
computer software can automatically adjust colour as well as brightness
and contrast. Start out with these 'auto' settings -- sometimes
the results can be surprisingly good.
If
you wish to adjust the colour manually, some knowledge of the physics
of colour is necessary. All colour is made up of the three primary
colours -- red, green, and blue. Three other colours called the
'subtractive primary colours' are obtained by removing one of the
primary colours where the other two are mixed. The three subtractive
primary colours are yellow, cyan, and magenta.
This
knowledge of how colours interact allows you to correct improper
colour balances. For example, if an image is too red, adding some
cyan (the opposite of red) can help to naturalize the colour.
Software
can also be used to adjust colour intensity. Subtle use of imaging
software can help to turn good photographs into great photographs.
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Digital
Camera Buying Guide – Part 1
Aperture: A Vital Key
to Digital Photography Success
Lighting: Why its So
Important and How to Use it Properly
How to Print
Your Digital Images: Part 1
Everything You Need
to Know About Shutter Speed
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