make tile-image(50px * 50px) from the same image using ImageMagick.

montile.sh

#!/bin/sh

if [ $# -ne 3 ]
then
    exit 1
fi

base=$1
x=$2
y=$3
extension=${base##*.}

mkdir -p /tmp/montile
convert -geometry 50x50 $base /tmp/montile/0.$extension

count=1
allimg=""
while [ $count -le `expr $x \* $y` ]
do
    img=/tmp/montile/${count}.$extension
    convert -font /Library/Fonts/Osaka.ttf -pointsize 20 -fill "#ffffff" -annotate 0x0+5+32 $count /tmp/montile/0.$extension $img
    allimg="$allimg$img "
    count=`expr $count + 1`
done

montage -tile "${x}x${y}" -geometry 50x50 $allimg tile.$extension

rm -rf /tmp/montile