from tkinter import *
Fenetre=Tk()
photo=PhotoImage(file="cadenas.gif",format="gif -index 1")
labl = Label(Fenetre, image=photo)
labl.pack()
Fenetre.mainloop()

from tkinter import *
Fenetre=Tk()
photo=PhotoImage(file="cadenas.gif",format="gif -index 7")
labl = Label(Fenetre, image=photo)
labl.pack()
Fenetre.mainloop()