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A matrix that transforms color values from CIE XYZ color space to reference sensor color space.
This matrix is used to convert from the standard CIE XYZ color space to the reference sensor colorspace, and is used when processing raw buffer data.
The matrix is expressed as a 3x3 matrix in row-major-order, and contains a color transform matrix that maps colors from the CIE XYZ color space to the reference sensor color space (i.e. the "golden module" colorspace) under the second reference illuminant (CameraCharacteristics.SensorReferenceIlluminant2).
The white points chosen in both the reference sensor color space and the CIE XYZ colorspace when calculating this transform will match the standard white point for the second reference illuminant (i.e. no chromatic adaptation will be applied by this transform).
This matrix will only be present if the second reference illuminant is present.
Optional - This value may be null on some devices.