Follow-up Comment #1, bug #41295 (project grub):
...and even a bit more can be achieved with zopflipng:
$ for file in $(find . -name *.png) ; do zopflipng -m $file $file.new && mv
$file.new $file ; done
[...]
$ du -bc $(find . -name "*.png") | tail -n 1
1363348 total
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