img_processor_part.rb

payload = IronWorker.payload
file = download_image(payload)
payload['operations'].each do |op|
  puts "\nPerforming #{op['op']} with #{op.inspect}"
  output_filename = op['destination']
  image = MiniMagick::Image.open(file)
  image = self.send(op['op'], image, {}.merge(op))
  image.format op['format'] if op['format']
  write_image(image, output_filename)
  upload_file payload, output_filename
end