#!/bin/bash

if [ -z "$1" ]; then
	echo "Usage: ${0##*/} FILE..."
	exit 1
fi

while [ -n "$1" ]; do
	fname=${1%.*}
	fext=${1##*.}
	if [ -f "$1" ]; then
		echo "processing $1..."
#		dims=`identify "$1" | egrep -o ' [0-9]+x[0-9]+ '`
#		let x=$[ ${dims%x*} / 2 ]
#		#let y=$[ ${dims##*x} ]
#		echo $x $y
#		convert -crop $x "$1" "$fname.%1d.$fext"
		convert -crop 50%x100% "$1" "$fname.$fext"
		#convert -crop +$x "$1" "$fname.r.$fext"
	else
		echo "$1: No such file">&2
	fi
	shift
done