[net.micro.mac] color graphics in MacWorld

gist@utastro.UUCP (Marc Gist) (10/01/86)

  MacWorld has been running some very nice *color* bit-mapped
illustrations to accompany various articles. I'm curious as to
how color is assigned to the picture (assuming its drawn on a Mac)
and how the printing press recieves this information. I can see
overlays being used, but that seems kind of retrogressive.
  Anyone care to elaborate?