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I am using FreeSurfer to process my MRI data. I would like to locate the
V1 area, as a nii file. But when I use mris_convert –label2mask, the output file is not the mask I expected.
My command is as follow.

The nii file can not open in ITK_SNAP, because it is not a nifti file.
In freeview, It shows:

I wonder if it is a bug, or you can give me some advice. Thank you a lot!
Sincerely
Rosie Zhou