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A fixed black level offset for each of the color filter arrangement (CFA) mosaic channels.
This key specifies the zero light value for each of the CFA mosaic channels in the camera sensor. The maximal value output by the sensor is represented by the value in CameraCharacteristics.SensorInfoWhiteLevel.
The values are given in the same order as channels listed for the CFA layout key (see CameraCharacteristics.SensorInfoColorFilterArrangement), i.e. the nth value given corresponds to the black level offset for the nth color channel listed in the CFA.
Range of valid values:
>= 0 for each.
Optional - This value may be null on some devices.