Use ImageMagick to make a landscape image square

make_image_square.sh

#!/bin/bash

# Check if the correct number of arguments are provided
if [ "$#" -ne 3 ]; then
  echo "Usage: $0 input_file output_file bar_color"
  exit 1
fi

# Input and output filenames and bar color
input_file="$1"
output_file="$2"
bar_color="$3"

# Get the dimensions of the input image
dimensions=$(identify -format "%wx%h" "$input_file")
width=$(echo $dimensions | cut -d'x' -f1)
height=$(echo $dimensions | cut -d'x' -f2)

# Determine the size of the square canvas
if [ $width -ge $height ]; then
  canvas_size=$width
else
  canvas_size=$height
fi

# Create the square image with bars
convert "$input_file" -background "$bar_color" -gravity center -extent ${canvas_size}x${canvas_size} "$output_file"