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It is not identity if params

It is not identity if params are set correctly, this code piece propagates cmatrix to rgb_cam:

  if ((use_camera_matrix & (((use_camera_wb || dng_version)?0:1) | 0x2)) &&
      cmatrix[0][0] > 0.125)
  {
    memcpy(rgb_cam, cmatrix, sizeof cmatrix);
...

-- Alex Tutubalin