Geebax
Captain
Australia
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You appear to be referring back to the days of three-tube colour cameras or 3-chip cameras, and in those days the black level of each channel could be subject to fluctuations. Nowadays with single chip sensors, the need for black balance is not there, but interestingly, the meaning of the term has changed. A Black Balance these days is performed automatically in most cases to help conceal cell differences in the sensor that create dark patterns in the image. In more expensive cameras, you can make the camera perform a black balance, but in low cost cameras like the Phantom ones, it is called pixel mapping and is done once when the camera is being initially aligned.
White balance can still be done manually by shooting a recognised colour chip card, and the better colour grading packages, such as Blackmagic Resolve, can automatically recognise the chip card and adjust the colour balance correctly for you. The trouble is, with aerial photograpghy, shooting a colour chip card on the ground for reference has no bearing on what the camera sees once it is in the air.
On the other hand you can select a setting and go with it. I tend to use 6000K for most daytime stuff. And I post grade everyting, that's the way it is done these days, especially if you shot DNG or Log.
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