Hi Lauri,

Can you try the following syntax to convert single hemi?

mris_convert -c lh.gamma.mgh lh.white lh.gamma.mg.gii

I think ‘--combinesurfs’ works on surface files only. I don’t know how to combine thickness files.

Best,

Yujing

From: freesurfer-bounces@nmr.mgh.harvard.edu <freesurfer-bounces@nmr.mgh.harvard.edu> On Behalf Of Lauri Tuominen
Sent: Friday, January 13, 2023 12:29 PM
To: freesurfer@nmr.mgh.harvard.edu
Subject: [Freesurfer] mris_convert to gifti

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Dear Freesurfer experts, 

A quick question. I am trying to convert my cortical thickness analysis results into a gifti file preferably combining left and right, like so:

mris_convert --combinesurfs lh.gamma.mgh rh.gamma.mgh both.gamma.gii

I get this error: 

error: ERROR: MRISread: file 'lh.gamma.mgh' has 0 vertices!

Probably trying to use a scalar data file as a surface! 

It then try to convert a single hemi: 

mris_convert lh.gamma.mgh test.gii but I get the same error. 

The gamma file looks fine to me, so I am not sure what the issue is. 

I am running this version of freesurfer: freesurfer-darwin-macOS-7.2.0-20210713-aa8f76b

Could someone provide an example how this is done? 

Thank you so much! 

Lauri Tuominen