code: def get_pad(self, dpi):
      return int(max(self.offsets) / 72 * dpi)
  
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 2 for calling the OffsetFilter obj's underlying member method code with example usage: obj.get_pad(dpi) and returns: int