Nikon D780 DSLR Camera (Body Only) - Manual (Page 255)

209 Shooting Settings
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. The camera can store up
to six values for preset white balance in presets d-1 through d-6.
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
(
0 210). During live view, white balance can be
measured in a selected area of the frame (spot
white balance,
0 216).
Copy from existing
photograph White balance is copied from photo on memory
card (
0 221).