split a 3200x1200 image into left and right parts

split-3200x1200-image.sh

#!/bin/sh

IMAGE=$1
EXT=`echo $IMAGE | sed -e 's/.*\(\.[A-Za-z0-9]*\)$/\1/'`
BASE=`echo $IMAGE | sed -e 's/^\(.*\)\(\.[A-Za-z0-9]*\)$/\1/'`
LEFT_IMAGE="$BASE-left$EXT"
RIGHT_IMAGE="$BASE-right$EXT"

if [ "$IMAGE" = "" ]; then
        echo "Usage: $0 image.jpg"
        echo "  (image.jpg must be 3200x1200 pixel JPEG image)"
        exit
fi

if [ ! -f $IMAGE ]; then
        echo "$IMAGE does not exist"
        exit
fi

convert -crop 1600x1200+0+0 $IMAGE $LEFT_IMAGE
convert -crop 1600x1200+1600+0 $IMAGE $RIGHT_IMAGE