I want to gen a template images for testing, here this is

generator2.sh

doit() {
	echo $PWD
	if test -e $1.jpg ; then
		echo "already created $1"
	else
		echo Doing it for $1
		convert -size 400x400 plasma:fractal -blur 0x10 \
		tile_diag_source$1.jpg

		convert tile_diag_source$1.jpg     \( +clone -transpose \) \
		\( +clone -sparse-color voronoi '%w,0 white 0,%h black' \) \
		-composite \
		\( +clone -flop -chop 1x0 \) +append \
		\( +clone -flip -chop 0x1 \) -append \
		-resize 5000x5000 \
		tile_diag_mirror$1.jpg

		echo create tile_diag_mirror$1.jpg

		convert tile_diag_mirror$1.jpg \
		-font Arial -pointsize 1440	 \
		-draw "gravity center fill white  text 0,0 '$1'" \
		 $1.png
		 start=$end
		rm tile_diag_source$1.jpg
		rm tile_diag_mirror$1.jpg
	fi
}
export -f doit
parallel doit ::: $(seq $1 $2)