A bash script to split a Midjourney v5 grid of images using ImageMagick

split_mjv5_png.sh

#!/bin/bash

# Check if 'convert' is available
if ! command -v convert &> /dev/null; then
  echo "'convert' command not found. Please install ImageMagick and try again."
  exit 1
fi

input_file="$1"

if [[ -z "$input_file" ]]; then
  echo "Please provide an input file."
  exit 1
fi

if [[ ! -f "$input_file" ]]; then
  echo "Input file not found."
  exit 1
fi

if [[ ${input_file##*.} != "png" ]]; then
  echo "Please provide a .png file."
  exit 1
fi

dir_path=$(dirname "$input_file")
file_name=$(basename "$input_file" .png)

output_prefix="${dir_path}/${file_name}"

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

half_width=$((width/2))
half_height=$((height/2))

convert "$input_file" -crop "${half_width}x${half_height}+0+0" "${output_prefix}-1.png"
convert "$input_file" -crop "${half_width}x${half_height}+${half_width}+0" "${output_prefix}-2.png"
convert "$input_file" -crop "${half_width}x${half_height}+0+${half_height}" "${output_prefix}-3.png"
convert "$input_file" -crop "${half_width}x${half_height}+${half_width}+${half_height}" "${output_prefix}-4.png"