encode a jpg image file to base64 string and display it in an html file

encode_img.rb

require 'base64'

binary = File.open(File.join('.', 'img.jpg'), 'rb') do  |io|
    io.read	
end
encoded = Base64.encode64(binary)

printf('<img src="data:image/jpeg;base64,%s"></img>', encoded)

# ruby encode_img.rb > img.html
# open img.html with chrome or firefox