Should following a normal "custom" white balance process while at depth
result in accurate color capture? Any special considerations?

Actually, white-balance adjustments are designed specifically not to
give you accurate color capture, but rather to make the photo look
most like what the eye sees.

The eye (along with the mind) automatically converts most off-white
ambient light to white, so even in a large range of settings, white
looks white.

Film and digital sensors don't do this conversion automatically, so
they have to be set according to the lighting. Normally, this is a
good thing, but in caes of extreme lighting (sunsets, under water) you
don't want the lighting to look the same as it would it ordinary
daylight.


I would recommend shooting in RAW mode (if you can) and adjsuting
things later. Or if you cannot, shoow in a variety of WB settings.

-Joel

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