procimage

linux脚本编程的例子

# Set up the defaults
size=320
width=1
colour="-color black"
usage="Usage: $0 [-s N] [-w N] [-c S] imagefile..."

while getopts ":s:w:c:" opt; do
    case $opt in
      s  ) size=$OPTARG ;;
      w  ) width=$OPTARG ;;
      c  ) colour="-color $OPTARG" ;;
      \? ) echo $usage
           exit 1 ;;
    esac
done

shift $(($OPTIND - 1))

if [ -z "$@" ]; then
    echo $usage
    exit 1
fi

# Process the input files
for filename in "$*"; do
    ppmfile=${filename%.*}.ppm

    case $filename in
        *.gif ) giftopnm $filename > $ppmfile ;;

        *.tga ) tgatoppm $filename > $ppmfile ;;

        *.xpm ) xpmtoppm $filename > $ppmfile ;;

        *.pcx ) pcxtoppm $filename > $ppmfile ;;

        *.tif ) tifftopnm $filename > $ppmfile ;;

        *.jpg ) djpeg $filename > $ppmfile ;;

            * ) echo "$0: Unknown filetype '${filename##*.}'"
                exit 1;;
    esac

    outfile=${ppmfile%.ppm}.new.gif
    pnmscale -quiet -xysize $size $size $ppmfile |
        pnmmargin $colour $width |
        ppmquant -quiet 256 | ppmtogif -quiet > $outfile

    rm $ppmfile

done