You can change the color to be black or transparent.

---------- Forwarded message ----------
From: miracle ozzoude <miracooloz@gmail.com>
Date: Tue, Jul 4, 2017 at 10:23 AM
Subject: remove skull from gtmseg.mgz
To: Douglas N Greve <freesurfer@nmr.mgh.harvard.edu>

Hello Freesurfer, 

After running the first step of PETsurfer (https://surfer.nmr.mgh.harvard.edu/fswiki/PetSurfer). I viewed the image it created using freeview. When I change, the color map to Lookup Table, the image also included the skull. How can I remove the skull from gtmseg.mgz/prevent it from showing? Any help will be appreciated. Thanks. Please, see attached image

Best, 

Paul

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