#!/bin/sh
#
# Set the pixel aspect ratio of a TIFF file based on the image dimensions.
#

cmd=$(basename $0)

if [ ! -f "$1" ]; then
    echo "$cmd: No such file" >&2; exit 1
fi

res=$(tiffinfo "$1" | sed -n -E '/^  Image Width:/ {
  s/^.*: ([0-9]+).*: ([0-9]+).*$/\1x\2/
  p
}')
case "$res" in
320x200)
    aspopt="-x 10 -y 12 -u 1";;
320x400)
    aspopt="-x 20 -y 12 -u 1";;
320x512)
    aspopt="-x 2 -y 1 -u 1";;
640x350)
    aspopt="-x 1000 -y 1371 -u 1";;
640x400)
    aspopt="-x 10 -y 12 -u 1";;
*)
    exit;;
esac

tiffedit "$1" $aspopt
.