Well the deep shot is so defective with its magenta color that I don't think anything could help it. The question is, if it had been shot in a sLog profile, would it be easier to correct?
Thanks for taking the time to do that.
No, it would be even harder to correct. SLOG is meant to solve issues with dynamic range -- i.e. a very contrasty scene where the brightest part of the image and the darkest parts of the image are more than 7-8 stops apart. The scene you filmed isn't one of those situations. It's easy to tell -- just put up the histogram when recording the video or a waveform monitor in your video editor. Most likely, when shooting with no picture profile, you'll find that neither your blacks nor your whites are clipping. So you can easily represent all of the image in 7-8 stops of the standard no picture profile. All SLOG will do is compress those 7-8 stops of contrast into 3-4 instead.
After further testing over the past two days, I've basically found no situations where you NEED more than 7-8 stops shooting ambient light underwater. Think about it -- all those particles in the water strip away contrast resulting in a very flat image. That's why the most important rule of underwater photography/videography is to get as close to your subject as possible. The only situation where the scene has greater contrast than that is if you're shooting directly into the sun AND you're trying to preserve detail in the highlights AND the shadows (as opposed to just silhuetting whatever you're shooting against the sun). How often do you find yourself doing this with ambient light underwater?
SLOG only helps you preserve more luminance detail. It does not help you preserve more color detail. In fact, because it compresses the luminance range, it actually preserves less color detail. So no.. color correction of SLOG footage is never going to be easier than color correction of non-slog footage.
I will try to post some more of the tests I've done, including some UAWB tests in the 10-12 meter range and using all the different picture styles to see which creates the best colors over the next few days (or weeks.. I have a busy week next week). In the meantime, I'll leave you with another screen grab from a video shot today. No picture profile, picture style standard, 3m, underwater auto white balance.
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