A bash script to create a `favicon.ico` via Imagemagick

README.md

A bash script to create a favicon.ico via Imagemagick.

Usage:

./favicon.sh myimage.png

Creates a favicon.ico file in the same folder.

favicon.sh

#!/bin/bash
set -e

# 
# Create a favicon.ico from any image
# 
# requires Imagemagick
# https://legacy.imagemagick.org/Usage/thumbnails/#favicon
#

if [ -z "$1" ] || [ "$1" = "-h" ] || [ "$1" = "--help" ]; then    
  #-- Help
  if [ -z "$1" ]; then
    echo
    echo "Error: image file required"        
  fi
  echo
  echo "Usage: \"$0 <image>\""
  echo "  image - Can be any image file, but square PNGs work best."
  echo 
  exit
fi

convert $1 -background white \
  \( -clone 0 -resize 16x16 -extent 16x16 \) \
  \( -clone 0 -resize 32x32 -extent 32x32 \) \
  \( -clone 0 -resize 48x48 -extent 48x48 \) \
  \( -clone 0 -resize 64x64 -extent 64x64 \) \
  -delete 0 -alpha off -colors 256 favicon.ico