#!/bin/bash
# This script cuts a 3840x2160 in 4 pieces

convert "$1"'[1920x1080+0+0]' "${1%.*}_tl.png"
convert "$1"'[1920x1080+1920+0]' "${1%.*}_tr.png"
convert "$1"'[1920x1080+1920+1080]' "${1%.*}_br.png"
convert "$1"'[1920x1080+0+1080]' "${1%.*}_bl.png"