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发表于 2010-5-14 09:54:17
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http://en.wikipedia.org/wiki/Color_temperature
... "Photographers sometimes use color temperature meters. Color temperature meters are usually designed
to read only two regions along the visible spectrum (red and blue); more expensive ones read three regions
(red, green, and blue). However, they are ineffective with sources such as fluorescent or discharge lamps,
whose light varies in color and may be harder to correct for. Because it is often greenish, a magenta
filter may correct it. More sophisticated colorimetry tools can be used where such meters are lacking."..... |
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