code: def test_sepia():
      f = luispedro_jpg()
      sepia = mahotas.colors.rgb2sepia(f)
      assert sepia.shape == f.shape
  
imports: import mahotas
  import numpy
  from mahotas.tests.utils import luispedro_jpg
  from mahotas.colors import rgb2xyz, rgb2lab, xyz2rgb, rgb2grey, rgb2sepia
label_desc: Use image node_id 3 for calling a global function with example usage: test_sepia() without return types