Convert image files into their base64 strings from the command line, with each argument being a different single file.

Base64.rb

require 'base64'

if ARGV.length > 0
  #To64Html.new(ARGV[0]).html()
  ARGV.each do |arg|
    puts "Enconding file: " + arg.to_s
    img = File.open(arg, 'rb')
    encoded = 'data:image/png;base64,' + Base64.encode64(img.read).gsub(/\n/m, "")
    enfile = arg.gsub(/\.png|jpg|jpeg|gif/, ".txt")
    File.open(enfile, 'w:UTF-8') { |file| file.write(encoded) }
    puts "Saved encoded image to: " + enfile
    encoded_size = (File.size(enfile).to_f / 2**20).round(2)
    image_size = (File.size(arg).to_f / 2**20).round(2)
    puts "    --> Size: " + encoded_size.to_s + "MB, Base64/image ratio: " + (encoded_size * 100.0 / image_size).round(2).to_s + "%"
  end
end