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how to get XYZ colors?

i try to convert the camera color space to some meaningful standard color space (XYZ whould be a good start,but some wide gamut RGB will do too), but there are really *A LOT* of matrices and factors in imgdata.color... cam_xyz looks promising,but it seems that this is for camera_colorspace = cam_xyz * xyz_color, so exactly the opposite transformation i need. cam_xyz is a 4x3 matrix,so not it is not invertable (is it?). I have no idea what cmatrix,pre_mul cam_mul,rgb_cam (which also looks very promising,is it sRGB with fixed d65 white point?) is exactly for,or how they relate to each other. pls clarify some of this. :-)