text: import numpy as np
  
  from bokeh.plotting import figure, output_file, show
  
  output_file("tools_hover_tooltip_image.html")
  
  ramp = np.array([np.linspace(0, 10, 200)]*20)
  steps = np.array([np.linspace(0, 10, 10)]*20)
  bitmask = np.random.rand(25, 10) > 0.5
  
  data = dict(image=[ramp, steps, bitmask],
              squared=[ramp**2, steps**2, bitmask**2],
              pattern=['smooth ramp', 'steps', 'bitmask'],
              x=[0, 0, 25],
              y=[5, 20, 5],
              dw=[20,  20, 10],
              dh=[10,  10, 25])
  
  TOOLTIPS = [
      ('index', "$index"),
      ('pattern', '@pattern'),
      ("x", "$x"),
      ("y", "$y"),
      ("value", "@image"),
      ('squared', '@squared')
  ]
  
  p = figure( x_range=(0, 35), y_range=(0, 35), tools='hover,wheel_zoom', tooltips=TOOLTIPS)
  p.image(source=data, image='image', x='x', y='y', dw='dw', dh='dh', palette="Inferno256")
  
  show(p)
  