Down convert images for older iphones

convert.rb

def get_images
  Dir['*.{png, gif, jpeg}']
end

def image_is_2x?(image)
  image.include?('@2x')
end

get_images.each do |image|
  old_image = image
  unless image_is_2x? image
    parts = image.split('.')
    newname = "#{parts[0]}@2x.#{parts[1]}"
    puts "Renaming #{image} to @2x"
    system("mv #{image} #{newname}")
    image = newname
  end
  puts "Converting #{image} to 50% as #{old_image}"
  system("convert #{image} -filter Lanczos -resize 50% #{old_image}")
end