Hi,
For future trips, you might find
the piece in PDN4 useful.
Colour correction of UW footage is complex, as the light conditions change between clips and as we shoot. Perhaps a key question is about "looking good" or "looking realistic"?
The main problem is to compensate for the loss of red light but without introducing too much, particularly with "whiter" parts of the video - like bubbles, or beams of sunlight. If this is not carefully done, the dolphins look great, but you end up blowing red bubbles!
So, in
this example which looks "realistic" (but not colour popped), over the full clip on my monitors, until the surface shot shows the red colour correction, I used a small trick, working only in PDR17.
I adjusted the white balance of the original, not by choosing a white base or a black base, but just by eye to get a good balance. This produced a reasonable result but with a green tinge.
I dropped the original clip (too blue) into track 2 and adjusted the opacity to "blend the clips", it introduced the blue back, but just enough to compensate.
Haze removal is also a difficult one, but CDR has the function.
This example is the previous adjusted clip dropped into CDR and a Dehaze value of 10 applied. Any more than 15 introduces artifacts, to my eye, but the "....eye of the beholder etc."
I dived in Croatia in 2017, without my proper contact lenses and couldn't adjust my white balance properly (lost my one push shortcut and couldn't see the tiny menu!) so all the dive was uncorrected and I cannot get most of it back "realistically", although at 44m it was beyond my camera's white balance anyway - there's just no red light left at all!
If you're interested,
this video is all shot with the same camera, from surface shots to 30m, but with white balance.adjusted every 2-3 metres. No post correction was done. In the shallow depth shots, the problem of uber bright sunshine and reflections off the sand showed the weakness in my camera in dealing with the differing exposures needed.
Adrian.
This message was edited 3 times. Last update was at Jan 16. 2019 06:29
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