#!/bin/sh

for x in $(find images/ -name "*.png"); do
	echo "Processing ${x}"
	identify -quiet -verbose "${x}" | grep "alpha: 1-bit" > /dev/null
	if [ "$?" -ne "0" ]; then
		# non-1-bit-alpha image, process normally
		optipng -o7 -quiet "${x}"
	else
		# disable color type reduction because that will break
		# transparency for the images in JOSM using the current
		# image loading method (see #1576)
		optipng -nc -o7 -quiet "${x}"
	fi
done