Nikon D300 User Manual (en)

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White Balance Fine Tuning
The colors on the fine-tuning axes are relative, not absolute. For example, 
moving the cursor to B (blue) when a “warm” setting such as 
(incandescent) is selected for white balance will make photographs 
slightly “colder” but will not actually make them blue.
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“Mired”
Any given change in color temperature produces a greater difference in 
color at low color temperatures than it would at higher color 
temperatures. For example, a change of 1000 K produces a much greater 
change in color at 3000 K than at 6000 K. Mired, calculated by multiplying 
the inverse of the color temperature by 10
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, is a measure of color 
temperature that takes such variation into account, and as such is the unit 
used in color-temperature compensation filters. E.g.:
• 4000 K–3000 K (a difference of 1000 K)=83 mired
• 7000 K–6000 K (a difference of 1000 K)=24 mired