Fix to mrresize: make sure the new image extent is centred wrt to the original extent. This is important when the extent changes due to the new voxel size not being an exact multiple of the original extent
Fix to mrresize: make sure the new image extent is centred wrt to the original extent. This is important when the extent changes due to the new voxel size not being an exact multiple of the original extent

MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3