Nikon D90 - Manual (Page 119)

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Choosing a Color Temperature
At a setting of K (Choose color temp.), color temperature can be selected by
pressing the WB button and rotating the sub-command dial until the desired value is
displayed in the control panel. Color temperature can also be selected in the
shooting menu (pg. 165).
A Color Temperature
The perceived color of a light source varies with the viewer and other conditions. Color
temperature is an objective measure of the color of a light source, defined with reference to
the temperature to which an object would have to be heated to radiate light in the same
wavelengths. While light sources with a color temperature in the neighborhood of 5,000–
5,500 K appear white, light sources with a lower color temperature, such as incandescent light
bulbs, appear slightly yellow or red. Light sources with a higher color temperature appear
tinged with blue.
A Choose Color Temperature
Note that the desired results will not be obtained with flash or fluorescent lighting. Choose N
(Flash) or I (Fluorescent) for these sources. With other light sources, take a test shot to
determine if the selected value is appropriate.
A The White Balance Menu
Color temperature can also be selected in the white balance menu. Note that the color
temperature with the WB button and the sub-command dial replaces the value selected in the
white balance menu.
WB button Sub-command dial Control panel