Nikon D4 User Manual page 194

Copying White Balance from a Photograph
Follow the steps below to copy a value for white balance from an
existing photograph to a selected preset.
1
Select L (Preset
manual) for White
balance in the
shooting menu.
Press the G button and
select White balance in
the shooting menu. Highlight Preset manual and press 2.
2
Select a destination.
Highlight the destination
preset (d-1 to d-4) and press
the center of the multi selector.
3
Choose Select image.
Highlight Select image and
press 2.
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G button