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Hero2 only has auto WB. You will have to do it in software.
Yes, its the same. I've done it as demonstrated above. It works just fine for the most part.Yes, however, if you shoot a white reference card underwater, can't you adjust it in post based on the white card? I know in Photoshop you can do this by clicking on the eyedropper tool from Levels and click on a color that is supposed to be white, not sure if it works the same way with video editing...
I'm not sure what you mean by that. What I do is just throw those cards in front of my camera as it's recording every now and then, especially when the lighting or depth changes. Then, later when I'm editing in post, I use those brief shots of the cards and create color correction presets with them (after I've used the color corrector dropper tool on the cards in that frame) and then I apply those color correction presets to any video clips that share that same lighting situation. It makes it very easy and fairly quick instead of trying to color correct completely on your own by trial and error.I would think that if you are shooting RAW then setting the white balance when shooting the pics wouldn't matter because you have full control over changing the color temperature in Lightroom, Camera Raw, etc.
Now that makes sense.If you set WB to auto the camera will constantly try and adjust for what it sees as changing conditions, in some cases getting it completely wrong altogether turning everything fluoro green. Raw mode turns off any in-camera WB processing making it easier to adjust in post if you have a white reference like the cards mentioned above.