#!/bin/bash
function rename_png(){
        while read raw data n ; do
                old="$raw $data $n"
                new="$raw $data $(printf '%04u' ${n%%.png}).png"
                [ "$old" = "$new" ] || mv -v "$old" "$new"
        done
}
/bin/ls -1 Raw\ Data\ [0-9][0-9]*.png | rename_png