#! /bin/csh -f 
# Last edited on 1999-03-14 21:33:56 by stolfi

cat vell1.pgm | ppmbrighten -v -10 | ppmtopgm > /tmp/a.pgm
cat plunk.pgm | ppmbrighten -v -90 | ppmtopgm > /tmp/b.pgm
pnmarith -add /tmp/a.pgm /tmp/b.pgm | pnmdepth 255 > flunk.pgm