Split Midjourney image grid into individual images

split-grid.sh

#!/bin/sh

set -e

ext=".$(basename "$1" | rev | cut -d'.' -f1 | rev)"
fname="$(basename "$1" "$ext")"

width="$(identify -format "%w" "$1")"
height="$(identify -format "%h" "$1")"

w="$((width / 2))"
h="$((height / 2))"

magick "$1" -crop "$w"x"$h"+0+0        "${fname}-1${ext}" 
magick "$1" -crop "$w"x"$h"+"$w"+0     "${fname}-2${ext}"
magick "$1" -crop "$w"x"$h"+0+"$h"     "${fname}-3${ext}" 
magick "$1" -crop "$w"x"$h"+"$w"+"$h"  "${fname}-4${ext}"