split single image into multiple tiles w/imagemagick

imageslice.sh

#!/bin/bash
#copyright: 2009
#author: gabriel dunne
#url: quilime.com

IMAGE=$1
IMAGE_W=$2
IMAGE_H=$3
ROWS=$4
COLS=$5

if [ $# -eq 0 ]
then
        echo "usage: image width height rows cols"
        echo "example: ./slice.sh Sunset.jpg 800 600 16 16"
        exit
else

        for (( x = 1; x <= COLS; x++ ))
        do
            for (( y = 1 ; y <= ROWS; y++ ))
            do
                let CROP_X = `expr $IMAGE_W-IMAGE_W/$x`
                let CROP_Y = `expr $IMAGE_H-IMAGE_H/$y`
                let CROP_W = `expr $IMAGE_W/$ROWS`
                let CROP_H = `expr $IMAGE_H/$COLS`
                echo -n "crop ${CROP_W}x${CROP_H}+${CROP_X}+${CROP_Y} result: [${x},${y}]_$IMAGE"
                echo ""
                        convert $IMAGE -crop ${CROP_W}x${CROP_H}+${CROP_X}+${CROP_Y} [${x},${y}]_$IMAGE
            done
        done
        
fi