#!/bin/sh
#
# This will try to process each GIF or JPEG file on the command line and make
# a small version of it using Netscape colors.  Output files are created
# in the current working directory.
#
# edit the FRACTION for a different size
# edit "-small." to create different output file names

FRACTION=0.2

while [ $# -gt 0 ]; do

  ftype=`file $1`
  type=`echo $ftype | awk 'BEGIN{FS=":"}{print $2}'`
  ext=`echo $1 | awk 'BEGIN{FS="."}{print $NF}'`
  base=`basename $1 .$ext`
  echo "$type"
  case "$type" in
    *GIF* )
      echo "$ftype"
      giftopnm "$1" | \
      pnmscale $FRACTION | \
      ppmquant -map /home/ljg/util/netscape-colors.ppm | \
      ppmtogif -sort > ${base}-small.${ext}
      ;;
    *JPEG* )
      echo "$ftype"
      djpeg -dct float "$1" | \
      pnmscale $FRACTION | \
      ppmquant -map /home/ljg/util/netscape-colors.ppm | \
      cjpeg -quality 80 -optimize -dct float > ${base}-small.${ext}
      ;;
    * )
      echo "ignoring $1"
      ;;
  esac
  shift

done

exit