<https://forums.getpaint.net/topic/20094-limit-number-of-colors/#comment-337706>
<http://schema.org/text>
"This is brand new from @Cookies (as he said above).  It should do the job for you: Simulate color depth "
<https://forums.getpaint.net/topic/20094-limit-number-of-colors/?tab=comments#comment-337637>