code: def process_image(self, padded_src, dpi):
      t1 = self.gauss_filter.process_image(padded_src, dpi)
      t2 = self.offset_filter.process_image(t1, dpi)
      return t2
  
imports: import matplotlib.pyplot
  import numpy
  from matplotlib.artist import Artist
  import matplotlib.cm
  from matplotlib.colors import LightSource
  import matplotlib.transforms
label_desc: Use image node_id 3 for calling the DropShadowFilter obj's underlying member method code with example usage: obj.process_image(padded_src, dpi) and returns: t2