#!/bin/sh
#first I save the base name you gave as argument to outline
#in a Little file fore later use.
echo "$1" >name.tmp;
#first I make it a pgm (gray scale image) because Po can't handle a full color photo.
#I want my outline to be the only totally black thing in the image
#so now I remove all black by substituting black with white in the
#image.
ppmtopgm $1.pnm |ppmchange rgb:0/0/0 rgb:f/f/f >ret0.tmp;

#but if there is nothing black in the image Po will give me no
#black to paint with ether. So I need to ad a little black in a plays
#where it can be easily removed again. A little black line on the
#left edge of the image.

pnmpad -left=2 ret0.tmp |ppmtopcx >tmp.pcx;
po tmp.pcx