wb_command -volume-merge allows you to select specific maps despite its name.  
It contains functionality similar to both fslmerge and bfslroi.

Peace,

Matt.

From: 
<hcp-users-boun...@humanconnectome.org<mailto:hcp-users-boun...@humanconnectome.org>>
 on behalf of Xavier Guell Paradis <xavie...@mit.edu<mailto:xavie...@mit.edu>>
Date: Tuesday, December 12, 2017 at 6:35 PM
To: "hcp-users@humanconnectome.org<mailto:hcp-users@humanconnectome.org>" 
<hcp-users@humanconnectome.org<mailto:hcp-users@humanconnectome.org>>
Subject: [HCP-Users] -cifti-separate converts from dscalar to nifti: is it 
possible to generate one nifti from each dscalar map?

Dear HCP experts,
I have a dscalar file with 4 maps and would like to convert each map into one 
separate nifti file. I am not worried about the problem of surface information 
in a nifti file, because I am interested in subcortical data only.
I have been able to transform the dscalar into a nifti file using this:
wb_command -cifti-separate input.dscalar.nii COLUMN -volume-all output.nii
The output.nii is a nifti file which contains 4 maps if I open it with wb_view. 
Is there a way to generate 4 separate nifti files (one for each map) instead of 
one single nifti file with all 4 maps?

Thank you very much,
Xavier.

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