#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# Copyright (c) 2015 Jérémie DECOCK (http://www.jdhp.org)

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

# SEE: http://effbot.org/tkinterbook/photoimage.htm#patterns

# Required Debian package (Debian 8.1 Jessie): python3-pil.imagetk

import tkinter as tk
import PIL.Image as pil      # PIL.Image is a module not a class...
import PIL.ImageTk as piltk  # PIL.ImageTk is a module not a class...

def main():
    """Main function"""

    # Tkinter

    # WARNING:
    # A Tk window MUST be created before you can call PhotoImage!
    # See: http://stackoverflow.com/questions/3177231/python-pil-imagetk-photoimage-is-giving-me-a-bus-error
    #      http://stackoverflow.com/questions/1236540/how-do-i-use-pil-with-tkinter

    root = tk.Tk()

    # PIL

    # WARNING:
    # You must keep a reference to the image object in your Python program,
    # either by storing it in a global variable, or by attaching it to another
    # object!
    #
    # When a PhotoImage object is garbage-collected by Python (e.g. when you
    # return from a function which stored an image in a local variable), the
    # image is cleared even if it’s being displayed by a Tkinter widget.
    #
    # To avoid this, the program must keep an extra reference to the image
    # object. A simple way to do this is to assign the image to a widget
    # attribute, like this:
    #
    #    label = Label(image=tk_photo)
    #    label.image = tk_photo        # keep a reference!
    #    label.pack()
    #
    # (src: http://effbot.org/tkinterbook/photoimage.htm#patterns)
    # See also http://infohost.nmt.edu/tcc/help/pubs/pil/image-tk.html
    
    pil_image = pil.open("lenna.png")
    tk_photo = piltk.PhotoImage(pil_image)

    # Tkinter

    label = tk.Label(root, image=tk_photo)
    label.pack()

    root.mainloop()

if __name__ == '__main__':
    main()

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# Copyright (c) 2015 Jérémie DECOCK (http://www.jdhp.org)

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

# SEE: http://effbot.org/tkinterbook/photoimage.htm#patterns

# Required Debian package (Debian 8.1 Jessie): python3-pil.imagetk

import tkinter as tk
import PIL.Image as pil_img   # PIL.Image is a module not a class...
import PIL.ImageTk as pil_tk  # PIL.ImageTk is a module not a class...

def main():
    """Main function"""

    # Tkinter

    # WARNING:
    # A Tk window MUST be created before you can call PhotoImage!
    # See: http://stackoverflow.com/questions/3177231/python-pil-imagetk-photoimage-is-giving-me-a-bus-error
    #      http://stackoverflow.com/questions/1236540/how-do-i-use-pil-with-tkinter

    root = tk.Tk()

    # PIL

    # WARNING:
    # You must keep a reference to the image object in your Python program,
    # either by storing it in a global variable, or by attaching it to another
    # object!
    #
    # When a PhotoImage object is garbage-collected by Python (e.g. when you
    # return from a function which stored an image in a local variable), the
    # image is cleared even if it’s being displayed by a Tkinter widget.
    #
    # To avoid this, the program must keep an extra reference to the image
    # object. A simple way to do this is to assign the image to a widget
    # attribute, like this:
    #
    #    label = Label(image=tk_photo)
    #    label.image = tk_photo        # keep a reference!
    #    label.pack()
    #
    # (src: http://effbot.org/tkinterbook/photoimage.htm#patterns)
    # See also http://infohost.nmt.edu/tcc/help/pubs/pil/image-tk.html
    
    pil_image = pil_img.open("lenna.png")
    tk_photo = pil_tk.PhotoImage(pil_image)

    # Tkinter

    label = tk.Label(root, image=tk_photo)
    label.pack()

    root.mainloop()

if __name__ == '__main__':
    main()

Change PIL alias.