code: def get_rgb(self):
      return self.ctx.get_source().get_rgba()[:3]
  
imports: import functools
  import gzip
  import math
  import numpy
  from ..None import _api, cbook, font_manager
  from matplotlib.backend_bases import _Backend, FigureCanvasBase, FigureManagerBase, GraphicsContextBase, RendererBase
  from matplotlib.font_manager import ttfFontProperty
  from matplotlib.path import Path
  from matplotlib.transforms import Affine2D
label_desc: Use image node_id 11 for calling the GraphicsContextCairo obj's underlying member method code with example usage: obj.get_rgb() and returns: self