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Hi Freesurfer team,

Sorry to ask a new question about FreeSurfer coordinates (I know it has been 
debated multiple times reading old messages) but I am still confused with all 
these spaces.
I have a very simple use case in Freeview, when I load the T1.mgz image I would 
need to get the "TkReg RAS" coordinate of points using the pixel positions 
(last line in Cursor/Mouse coordinates in Freeview).
I know Freeview is providing the conversion but I would need to be able to 
extract the "TkReg RAS" coordinates for multiple pixel positions in the T1.mgz 
file.

I've read the FreeSurfer documentation 
(https://surfer.nmr.mgh.harvard.edu/fswiki/CoordinateSystems) but it is still 
confused for me when I look at the coordinates in Freeview...
Which transformation is used to convert pixel coordinate (T1.mgz) to Talairach, 
TKReg RAS and RAS systems?
I also found this interesting link http://brainmap.org/icbm2tal/ and 
implemented the mni2tal / spm2tal / fsl2tal / other2tal transformations (in 
Python/Numpy) but unfortunately none of them gave me good results.

Thanks for your help.

Florent

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