Nikon D300s - Manual (Page 168)

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Preset Manual
Preset manual is used to record and recall custom white balance
settings for shooting under mixed lighting or to compensate for
light sources with a strong color cast. Two methods are available
for setting preset white balance:
Method Description
Direct measurement
Neutral gray or white object is placed under
lighting that will be used in final photograph and
white balance is measured by camera (
0 144).
Copy from existing
photograph
White balance is copied from photo on memory
card (
0 148).