[arfar]

But #fefefe isn't black or white? I presume the commenter specifically didn't say greyscale.

EDIT- checked the source:

It looks like imagemagick's 'threshold' [0] command is being used, so everything is max/min/black/white:

https://github.com/firstlookmedia/pdf-redact-tools/pull/23/c...

[0] https://www.imagemagick.org/script/command-line-options.php#...