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Is the camera color matrix

Is the camera color matrix you're talking about rgb_cam?
Since it gets only used when use_camera_matrix=1, I guess that this matrix is a "camera as shot" to rgb6500K... Is that Right?

In the case of my image, there is quite a big difference between use_camera_matrix=1 and LibRaw built in... LibRaw built in produces a much warmer image -I like it better on that specific picture-...
Any idea about the reason behind that? Are Sony raw files known to have differences between the camera_matrix and the cam_mul they include? Or is cam_mul not in the raw file but calculated from camera_matrix for Sony raws?