#!/bin/bash

# take two arguments (first a jpeg) and make a thumbnail size version
# stored in the second argument

if [ $# != 2 ]
then
  echo "$0: need 2 arguments: source-jpeg destination-file"
  exit 1
fi
 
(djpeg < $1) | pnmscale -xysize 100 150 | cjpeg > $2

# exit code is taken from last command(s) executed if not given explicitly