#!/bin/bash

USAGE="$0 <orig image> <target base dir>"

case "$1" in
  "")  echo $USAGE
       exit 1
       ;;
   *)  ORIG="$1"
       ;;
esac

case "$2" in
  "")  echo $USAGE
       exit 1
       ;;
   *)  DIR="$2"
       ;;
esac

FILE=$(echo ${ORIG##*/} | tr '[A-Z]' '[a-z]')
BIG="$DIR"/pics
SMALL="$DIR"/small
BIGFILE="$BIG"/"$FILE"
SMALLFILE="$SMALL"/"$FILE"

[ -d "$DIR" ] || mkdir "$DIR"
[ -d "$BIG" ] || mkdir "$BIG"
[ -d "$SMALL" ] || mkdir "$SMALL"

jpegtopnm < "$ORIG" | pnmscale -xysize 1024 768 | ppmtojpeg > "$BIGFILE"
jpegtopnm < "$ORIG" | pnmscale -xysize 256 192 | ppmtojpeg > "$SMALLFILE"