Support OR mode which is enabled by -O, --ormode option. #133
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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.