Hi Paul, You can change the environment variable that controls that. Run the command below in your terminal and/or put it in your .bashrc file: export FSLOUTPUTTYPE=NIFTI Cheers, David > On Jul 29, 2016, at 10:23 AM, Paul GRAVEL <[log in to unmask]> wrote: > > Dear All, > > Is there a way to turn off file compression in FSL? > > I am currently testing a package that calls FSL, but it complains that it cannot read the .nii.gz files. > Looking at the code of this package, it can only read .nii files. So before starting to modify the code, I was wondering if there was an easier way by going directly to the source. > > Many thanks! > > Paul