signs_lib/util/convert.sh

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# inverts signs_lib font to black on transparent background
img_path=./
#img_results=./converted
#mkdir -p $img_results
for img in ${img_path}/*;
do
# convert -negate $img ${img_results}/${img#./*};
convert $img -background white -alpha remove -alpha off -negate -transparent white $img
done