A bash script to create a nice trio of images using imagemagick

image_trio.sh

#!/bin/bash

if [ "$#" -ne 3 ]; then
    echo "Usage: $0 <image1> <image2> <image3>"
    exit 1
fi

image1="$1"
image2="$2"
image3="$3"

size="600x600"
border_size="10x10"
quality=95

temp1="temp_resized_1.jpg"
temp2="temp_resized_2.jpg"
temp3="temp_resized_3.jpg"
bordered1="temp_bordered_1.jpg"
bordered2="temp_bordered_2.jpg"
bordered3="temp_bordered_3.jpg"

output="result.jpg"

convert "$image1" -resize "$size^" -gravity center -crop "$size+0+0" +repage -quality $quality "$temp1"
convert "$image2" -resize "$size^" -gravity center -crop "$size+0+0" +repage -quality $quality "$temp2"
convert "$image3" -resize "$size^" -gravity center -crop "$size+0+0" +repage -quality $quality "$temp3"

convert "$temp1" -bordercolor White -border $border_size -quality $quality "$bordered1"
convert "$temp2" -bordercolor White -border $border_size -quality $quality "$bordered2"
convert "$temp3" -bordercolor White -border $border_size -quality $quality "$bordered3"

convert "$bordered1" "$bordered2" "$bordered3" +append -quality $quality "$output"

rm "$temp1" "$temp2" "$temp3" "$bordered1" "$bordered2" "$bordered3"

echo "Output saved to $output"