Before the new release, If anyone need png file from lrf but want rename it:
CWD=`pwd`
find . -type d -print | while read direct
do
cd $direct
for file in [0-9]*.png
do
if [ ! -f "$file" ]; then
break
fi
bname=`basename $file .png`
nname=`printf %06d $bname`
mv $file $nname.png
done
cd $CWD
done
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