<https://forums.getpaint.net/topic/31843-hsv-eraser/#comment-426925>
<http://schema.org/text>
"I think I've fixed most of the bugs. I also added an RGB distance tolerance, since sometimes that's useful, either alone or combined with the HSV tolerance. "
<https://forums.getpaint.net/topic/31843-hsv-eraser/?tab=comments#comment-426908>