125
P, S, A, and M Modes
A
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
J
(incandescent) is selected will make photographs slightly “colder”
but will not actually make them blue.
A
“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
6
, 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
