code: def pixel_data(self):
      """One 2-d channel of the color image as a numpy array"""
      if self.__image.pixel_data.dtype.kind == "b":
          return self.__image.pixel_data.astype(numpy.float64)
  
      return self.__image.pixel_data[:, :, 0]
  
imports: import numpy
label_desc: Use image node_id 3 for calling the GrayscaleImage obj's underlying member method code with example usage: obj.pixel_data() and returns: self, self