libsixel
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Support OR mode which is enabled by -O, --ormode option.
I would like to add -O option to img2sixel. It enables "ormode" extension of Sixel Graphics. "ormode" is originally devised by https://twitter.com/isaki68k and https://twitter.com/moveccr for NetBSD/x68k. Please read http://www.pastel-flower.jp/~isaki/NetBSD/osc16hi/page40.html and https://github.com/isaki68k/sayaka/blob/master/vala/sixel.native.c#L133 for more information.
Here is more detailed information https://qiita.com/arakiken/items/26f6c67da5a9f9f907ac