This example is an application for displaying an image with the ability to stretch the window size arbitrarily (thus enabling to zoom in on the image):


from Tkinter import *
import Image, ImageTk
import sys

#
# an image viewer

class UI(Canvas):

def __init__(self, master, im):


x, y, orig_w, orig_h = im.getbbox()
Canvas.__init__(self, master,width=orig_w, height=orig_h)
tmpim = ImageTk.PhotoImage(im)
self.origim = im
self.image = tmpim
self.create_image(orig_w/2, orig_h/2, image=tmpim)

self.bind('',self.resizeImage)

top=self.winfo_toplevel()
top.rowconfigure(0, weight=1)
top.columnconfigure(0, weight=1)
self.rowconfigure(0, weight=1)
self.columnconfigure(0, weight=1)
self.grid(sticky=N+S+E+W)


def resizeImage(self,event):

im = self.origim.resize((event.width, event.height),Image.ANTIALIAS)
tmpim = ImageTk.PhotoImage(im)
self.image = tmpim
self.create_image(event.width/2, event.height/2, image=tmpim)

if not sys.argv[1:]:

print 'need an image name!'
exit()

else:

filename = sys.argv[1]

root = Tk()
root.title(filename)
im = Image.open(filename)

UI(root, im)
root.mainloop()