A Bash script to convert an image to a square by adding equal padding to its shorter dimension using ImageMagick.

make_square.md

Image Square Padding Script

This script takes an image as input and converts it into a square by adding equal padding to its shorter dimension. It utilizes ImageMagick for image processing.

Usage

./make_square.sh [input_image] [output_image]

Requirements

• ImageMagick

Example

./make_square.sh input.jpg output.jpg

This will take input.jpg, add necessary padding to make it square, and save the result as output.jpg.

make_square.sh

#!/bin/bash

# Input image
IMAGE="$1"

# Output image
OUTPUT="$2"

# Get width and height of the image
WIDTH=$(identify -format "%w" "$IMAGE")
HEIGHT=$(identify -format "%h" "$IMAGE")

# Calculate padding to be added to make the image square
if [ "$WIDTH" -gt "$HEIGHT" ]; then
    PAD=$(( (WIDTH-HEIGHT) / 2 ))
    # Check for an odd difference and adjust padding
    EXTRA_PAD=$(( (WIDTH-HEIGHT) % 2 ))
    convert "$IMAGE" -gravity center -background white -extent ${WIDTH}x$((HEIGHT+PAD*2+EXTRA_PAD)) "$OUTPUT"
else
    PAD=$(( (HEIGHT-WIDTH) / 2 ))
    # Check for an odd difference and adjust padding
    EXTRA_PAD=$(( (HEIGHT-WIDTH) % 2 ))
    convert "$IMAGE" -gravity center -background white -extent $((WIDTH+PAD*2+EXTRA_PAD))x${HEIGHT} "$OUTPUT"
fi