Nikon D300 User Manual page 677

the colors a bit. Normal camera WB on a cloudy, overcast day
might be about 6000K.
Just remember that we use the real Kelvin temperature range
in reverse and that red colors are considered warm while blue
colors are cool. Even though this is backwards from what we
were taught in school, it fits our situation better. To
photographers, blue seems cool while red seems warm! Just
don't let your astronomer friends convince you otherwise.
White Balance Fundamentals
Understanding WB in a fundamental way is simply
realizing that light has a range of colors that go from cool
to warm. We can adjust our cameras to use the available
light in an accurate and neutral, "balanced" way that
compensates for the actual light source. Or, we can allow a
color cast to enter the image by unbalancing the settings.
In this chapter, we will discuss this from the standpoint of
the D300(S)'s camera controls and how they deal with
WB.
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