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The standard reference illuminant used as the scene light source when calculating the CameraCharacteristics.SensorColorTransform2, CameraCharacteristics.SensorCalibrationTransform2, and CameraCharacteristics.SensorForwardMatrix2 matrices.
See CameraCharacteristics.SensorReferenceIlluminant1 for more details.
If this key is present, then CameraCharacteristics.SensorColorTransform2, CameraCharacteristics.SensorCalibrationTransform2, and CameraCharacteristics.SensorForwardMatrix2 will also be present.
Range of valid values:
Any value listed in CameraCharacteristics.SensorReferenceIlluminant1
Optional - This value may be null on some devices.