I can't say that I know it's been proven, but from a data acquisition standpoint, it makes sense and should be true. Doing color balance (or exposure) most correctly in camera will give more accurate results than tweaking later. Note: "more accurate" is not synonymous with "most appealing."
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"do you like it and think this is the best you can do with the subject and location and model and equipment?". - Glenn Usdin
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