nearblack(1) on Linux
The text 6c28a81d3bd3, as Debian 13 (Trixie) shipped it.
Convert nearly black/white borders to black.
Flags it lists
-
--help -
--help-general -
-alg -
-co -
-color -
-nb -
-near -
-o -
-of -
-q -
-setalpha -
-setmask -
-white