#!/bin/sh

# Crop a set of image files
#
# usage:
#
#       example% batch_crop left top width height image1 image2 etc
#
# writes output images crop_image1, crop_image2

# default prefix
VIPSHOME=${VIPSHOME-/usr/local}

name=`basename $0`

# check args
if [ $# -lt 5 ]; then
	echo "usage: $name left top width height image1 image2 ..."
	echo 
	echo "$name writes a new set of images called crop_image1, "
	echo "crop_image2, etc., each cropped to the specified size"

	exit 1
fi

left=$1
top=$2
width=$3
height=$4
shift 4

# convert each argument
for i in $*; do
	dir=`dirname $i`
	file=`basename $i`
	new=$dir/crop_$file
	echo "Cropping $file as $new ..." 

        if [ -f $new ]; then
                echo "$new exists, skipping"
        else
                $VIPSHOME/bin/vips im_extract_area $i $new $left $top $width $height
        fi
done


