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if [ ! -f "$1" ]; then
echo 'Image File Error!'
exit
fi
if [ -z "$2" ]; then
echo 'Width Error!'
exit
fi
if [ -z "$3" ]; then
echo 'Height Error!'
exit
fi
image="$1"
targetWidth="$2"
targetHeight="$3"
size=( `identify -format "%w %h" "${image}"` )
origWidth=${size[0]}
origHeight=${size[1]}
if (( origWidth > targetWidth )); then
echo "origWidth > targetWidth, exit"
exit
fi
if (( origHeight > targetHeight )); then
echo "origHeight > targetHeight, exit"
exit
fi
cp "${image}" "${image}.bak"
convert "${image}" -background none -gravity center -extent ${targetWidth}x${targetHeight} "${image}"
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