title: Display .png image with Tkinter and PIL
body: <p>I try to display .png file in Tkinter Label, but in effect I get just empty space in place where image should be displayed. It's very simple code and i have no idea what is wrong.</p>
  
  <pre><code>from Tkinter import *
  from PIL import Image, ImageTk
  
  root = Tk()
  
  image = Image.open('image.png')
  display = ImageTk.PhotoImage(Image.open(image))
  
  label = Label(root, image=display)
  label.pack()
  
  root.mainloop()
  </code></pre>