bin/troff2png

#!/usr/local/plan9/bin/rc

9 troff -ms $* | tr2post |
  gs -g1000x1000 -r144 -dNOPAUSE -dQUIET \
  	'-dGraphicsAlphaBits=4' '-dTextAlphaBits=4' \
  	 '-sOUTPUTFILE=-' '-sDEVICE=png16m' - quit.ps | 9 png -9t | 
  9 crop -c 255 255 255 | 
  9 topng