How to update the image of a Tkinter Label widget?

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The method label.configure does work in panel.configure(image=img).

What I forgot to do was include the panel.image=img, to prevent garbage collection from deleting the image.

The following is the new version:

import Tkinter as tk
import ImageTk


root = tk.Tk()

img = ImageTk.PhotoImage(Image.open(path))
panel = tk.Label(root, image=img)
panel.pack(side="bottom", fill="both", expand="yes")

def callback(e):
    img2 = ImageTk.PhotoImage(Image.open(path2))
    panel.configure(image=img2)
    panel.image = img2

root.bind("<Return>", callback)
root.mainloop()

The original code works because the image is stored in the global variable img.

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