text: #!/usr/bin/python
  # -*- coding: utf-8 -*-
  
  # thumbor imaging service
  # https://github.com/globocom/thumbor/wiki
  
  # Licensed under the MIT license:
  # http://www.opensource.org/licenses/mit-license
  # Copyright (c) 2011 globo.com timehome@corp.globo.com
  
  from thumbor.filters import BaseFilter, filter_method
  
  
  class Filter(BaseFilter):
  
      @filter_method()
      def grayscale(self):
          engine = self.context.modules.engine
          engine.convert_to_grayscale()
  