Hi, 

Is there a way to subtract one surface overlay from another (for example in fsaverage) and still having the output being an .mgh overlay file? 
I saw that mis_calc does a similar procedure but automatically outputs the result as out.mgz. 

Thank you for the help! 

Kind regards,
Tobias
 
_________________________________________ 
Tobias Granberg, MD, PhD 

Post-doctoral research fellow
A.A. Martinos Center for Biomedical Imaging 
Massachusetts General Hospital | Harvard Medical School

Resident in Radiology 
Karolinska Institutet | Department of Clinical Science, Intervention and Technology
Karolinska University Hospital | Department of Radiology