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Dear Expert, I have four T1 images in a directory. I am trying to use "for" function to reorient all images at once. But I am getting the following out put, and images were not reoriented. I think there is some mistake in the command line. Please correct the mistake. $ ls *.nii grp203_t1.nii grp205_t1.nii grp208_t1.nii grp209_t1.nii $ for fn in *.nii; do fslreorient2std $fn ; done 0.000000 0.000000 -1.000000 173.999741 -1.000000 0.000000 0.000000 255.000000 0.000000 1.000000 0.000000 0.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 -1.000000 174.001144 -1.000000 0.000000 0.000000 255.000000 0.000000 1.000000 0.000000 0.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 -1.000000 174.000748 -1.000000 0.000000 0.000000 255.000000 0.000000 1.000000 0.000000 0.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 -1.000000 173.998596 -1.000000 0.000000 0.000000 255.000000 0.000000 1.000000 0.000000 0.000000 0.000000 0.000000 0.000000 1.000000 And It is reoriented when I did separately. After reorientation the size of the image doubles (22.9 mb to 45.9 mb). Why there is increase in the size of the image after reorientation? Thanks in advance RB