Hi!

I am trying to make a ribbon.mgz from a non-human primate surface recon that does not have an aseg. Following this prior discussion: MailScanner has detected a possible fraud attempt from "secure-web.cisco.com" claiming to be Re: [Freesurfer] ribbon.mgz Without aseg.mgz (mail-archive.com) I tried mri_ribbon:

mri_ribbon ./surf/rh.white ./surf/rh.pial ./mri/orig.mgz 
rh.ribbon.mgz

Attached is the output. It looks like it roughly follows the grey matter, but especially the sulci seem to be filled. Unfortunately, there is no help for mri_ribbon. Any advice on how to proceed? The above mentioned discussion did not lead to a conclusion on how to get a ribbon without aseg.

Thank you! Caspar