#!/bin/sh -e

tmp=`mktemp`
trap "rm -f $tmp.jpg" HUP PIPE INT QUIT TERM EXIT
jpegtran -optimize -progressive -perfect -copy all "$1" > $tmp.jpg
cjxl $tmp.jpg "${1%.*}.jxl" -d 0 -e 9 --lossless_jpeg=1
[ -s "${1%.*}.jxl" ]