Scale pixel art images to 200%

Usage: ruby 2x.rb [-f] image.png another_image.png

https://gist.github.com/raine/9390642

#!/usr/bin/env ruby

# [sudo] gem install rmagick
require 'rmagick'

def prepend_ext(path, with)
 with_ext = File.basename path
 ext = File.extname path
 no_ext = File.basename path, ext
 path.sub with_ext, "#{no_ext}#{with}#{ext}"
end

if ARGV.first === '-f'
 ARGV.shift
 force = true
end

if ARGV.empty?
 puts "Usage: #{__FILE__} [-f] FILE(S)"
 exit
end

ARGV.each do |path|
 img = Magick::Image.read(path).first
 width = img.columns
 height = img.rows
 dst = (if force then path else "#{prepend_ext(path, '_2x')}" end)
 img.resize!(width * 2, height * 2, Magick::BoxFilter, 0)
 img.write dst
 puts "Wrote to #{dst}"
end