docs: def show(self):
          """Display the image"""
          with_matplotlib = True
          try:
              import matplotlib.pyplot as plt
          except RuntimeError:
              import skimage.io as io
              with_matplotlib = False
              
          if with_matplotlib:
              equalised_img = self.equalise()
              
              _, ax = plt.subplots()
              
              ax.imshow(equalised_img, cmap='gray')
      
              import random
              
              for contour_set in self.as_contours.itervalues():
                  r, g, b = random.random(), random.random(), random.random()
                  [ax.plot(contour[:,1], contour[:,0], linewidth=2, color=(r,g,b,1)) for contour in contour_set]
              
              ax.axis('image')
              ax.set_xticks([])
              ax.set_yticks([])
              
              plt.show()
          else:
              io.imshow(self.equalise())
              io.show()