image encoding to text by Base64 (refer: http://d.hatena.ne.jp/yuheiomori0718/20111209/1323432840 )

image2base64.rb

#!/usr/bin/env ruby

require 'base64'
print "image filename: "
image_name = gets.chomp
filename = image_name.sub(/\.(\w+)$/) { "_base64_#{$1}.txt" }
open(filename, 'w') { |f| f.write(Base64.encode64(open(image_name).read).tr("\n", "")) }