text: import matplotlib.cm as cm
  import matplotlib.pyplot as plt
  import numpy as np
  from PIL import Image
  import os
  
  OUTPUT_DIR = os.path.join("static", "images", "colormaps")
  WIDTH = 512
  
  def create_image(cmap, width):
      values = np.linspace(0, 1, width)
      colors = cmap(values).reshape((1, width, 4))
      image = Image.fromarray(np.uint8(255 * colors))
      return image
  
  cmap_names = {}
  cmap_names['Uniform'] = [
              'viridis', 'plasma', 'inferno', 'magma']
  cmap_names['Diverging'] = [
              'seismic', 'RdYlBu', 'Spectral'
              ]
  cmap_names['Miscellaneous'] = ['jet']
  
  if __name__ == "__main__":
      for category in cmap_names:
          category_dir = os.path.join(OUTPUT_DIR, category)
          if not os.path.exists(category_dir):
              os.mkdir(category_dir)
          for name in cmap_names[category]:
              result = create_image(plt.get_cmap(name), width=WIDTH)
              output_path = os.path.join(category_dir, "{}.png".format(name))
              print(output_path)
              result.save(output_path)
  
  