#! /bin/sh
pnmnoraw |
tail +3 |
tr -dc 01 |
char-to-code |
uniq -c |
awk 'NR==1 { if ($2==49) print "0"; }
	{ n=$1; while (n>255) { printf("255\n0\n"); n-=255; } print n; }' |
( tr \\n \  ; echo '' ) |
fold -w 72 -s |
tr \  ,