Dear List, I am using FSL 6.0.1 Even after explicitly stating the extension of my T1w file, which requires defacing ( fsl_deface T1w.nii.gz T1w_deface.nii) the error is shown below Error: input image not valid Kindly suggest the needful Thanks and regards Himanshu ######################################################################## To unsubscribe from the FSL list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/WA-JISC.exe?SUBED1=FSL&A=1 This message was issued to members of www.jiscmail.ac.uk/FSL, a mailing list hosted by www.jiscmail.ac.uk, terms & conditions are available at https://www.jiscmail.ac.uk/policyandsecurity/