bw to png with transparency

https://forums.bunsenlabs.org/viewtopic.php?id=3705

convert in.jpg \
\( -clone 0 -fill black -colorize 100% \) \
\( -clone 0 -negate \) \
-delete 0 -alpha off -compose copy_opacity -composite PNG32:out.png
# from http://www.imagemagick.org/discourse-server/viewtopic.php?t=21677
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