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- I'm a Fish!
Surely but which camera supports even 4:2:2 when recording? If you loose it when you record it doesn't come back later. Currently you need an external recorded through an hdmi stream on most devices that are not pro level otherwise it records at 4:2:0 and there is nothing you can improve. With limited capabilities in camera the best option for me is get the colors right first time and limit correction. I compare my video to those done with much more expensive equipment and lots of grading and I don't see a huge gap to be honest
Upsampling to 4-2-2 or to 4-4-4 does not improve the quality of the video in itself....the improvements come from when you modify the data with color correction, because now you have much larger gradations that record from the changes you make in correcting....the final result is crisp and sharp, and then when encoded to 4-2-0 from a sharp original, the result is much better than encoding from a blotchy and banded 4-2-0 avi or mov that had little room for correction.
As to shooting better, always the goal, but there are so many light to dark gradations in wide angle uw video, that often this is not realistic, if you want beautiful long distance backgrounds...and where video lights dont reach, and ambient light is black to white and a big x factor with rapidly moving marine life.