Short answer: different kinds of light have different temperatures; the light in the shade under a tree is cooler than out in the sun for instance. The picture takes on a color-cast when the wrong WB is used; blueish with cooler light, reddish with warmer light. Setting, or correcting afterwards, the WB brings the colors back to where they should be.
David
/edit: long answers: overview or in depth.
Message edited by author 2005-01-25 07:04:25.
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