#!/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..."
		convert -recolor '1 0 0 0 0 0 0 0 0' "$1" "$fname.l.$fext"
		convert -recolor '0 0 0 0 1 0 0 0 1' "$1" "$fname.r.$fext"
	else
		echo "$1: No such file">&2
	fi
	shift
done