This takes a really, really, long time to render. Space key to start copying or stop showing finished copy. Credit to @DadOfMrLog for the colour detection. https://scratch.mit.edu/projects/10941245/ Also don't try it on Forkphorus or Turbowarp, it just crashes.
My calculations say that this takes approx. 4 hours to render: 240 (width) * 360 (length) = 86400 pixels approx 6 pixels per second = 14400 seconds 14400 / 60 = 240 minutes 240 / 60 = 4 hours
