gistfile1.txt

#decode base64
Dir.mkdir('decoded_photos/')
Dir.foreach('./photos') do |item|
  next if !item.match(/.*_signature_image/)
  base64_encoded = File.read("photos/" + item)
  decocded = Base64.decode64(base64_encoded.split(',')[1])
  File.open("decoded_photos/#{item}.png", 'wb') do |file|
    file.write(decocded)
  end
end