old_contents: """
  =========================
  Interpolation: Edge Modes
  =========================
  
  This example illustrates the different edge modes available during
  interpolation in routines such as ``skimage.transform.rescale`` and
  ``skimage.transform.resize``.
  """
  from skimage._shared._interpolation_test import extend_image
  import skimage.data
  import matplotlib.pyplot as plt
  import numpy as np
  
  img = np.zeros((9, 9))
  img[:8, :8] += 1
  img[:4, :4] += 1
  img[:2, :2] += 1
  img[:1, :1] += 2
  
  modes = ['constant', 'nearest', 'wrap', 'reflect']
  fig, axes = plt.subplots(1, 4, figsize=(15, 5))
  for n, mode in enumerate(modes):
      img_extended = extend_image(img, pad=img.shape[0], mode=mode)
      axes[n].imshow(img_extended, cmap=plt.cm.gray, interpolation='nearest')
      axes[n].plot([8.5, 8.5], [8.5, 17.5], 'y--', linewidth=0.5)
      axes[n].plot([17.5, 17.5], [8.5, 17.5], 'y--', linewidth=0.5)
      axes[n].plot([8.5, 17.5], [8.5, 8.5], 'y--', linewidth=0.5)
      axes[n].plot([8.5, 17.5], [17.5, 17.5], 'y--', linewidth=0.5)
      axes[n].set_axis_off()
      axes[n].set_aspect('equal')
      axes[n].set_title(mode)
  
  plt.tight_layout()
  
  plt.show()
new_contents: """
  =========================
  Interpolation: Edge Modes
  =========================
  
  This example illustrates the different edge modes available during
  interpolation in routines such as ``skimage.transform.rescale`` and
  ``skimage.transform.resize``.
  """
  from skimage._shared._interpolation_test import extend_image
  import skimage.data
  import matplotlib.pyplot as plt
  import numpy as np
  
  img = np.zeros((16, 16))
  img[:8, :8] += 1
  img[:4, :4] += 1
  img[:2, :2] += 1
  img[:1, :1] += 2
  
  modes = ['constant', 'nearest', 'wrap', 'reflect']
  fig, axes = plt.subplots(1, 4, figsize=(12, 3))
  for n, mode in enumerate(modes):
      img_extended = extend_image(img, pad=img.shape[0], mode=mode)
      axes[n].imshow(img_extended, cmap=plt.cm.gray, interpolation='nearest')
      axes[n].plot([15.5, 15.5], [15.5, 31.5], 'y--', linewidth=0.5)
      axes[n].plot([31.5, 31.5], [15.5, 31.5], 'y--', linewidth=0.5)
      axes[n].plot([15.5, 31.5], [15.5, 15.5], 'y--', linewidth=0.5)
      axes[n].plot([15.5, 31.5], [31.5, 31.5], 'y--', linewidth=0.5)
      axes[n].set_axis_off()
      axes[n].set_aspect('equal')
      axes[n].set_title(mode)
  
  plt.tight_layout()
  
  plt.show()
subject: add visual example of edge modes