[Python] How to center a image in a canvas Python Tkinter

I am working on a program. That gets a image and puts it in a canvas. So it is like a photo viewer. But I would like to get the image in the center of the canvas widget. But it seems to go into the top left corner. Why does it do this? And how can I get it in the center of the canvas widget?

Code:

from Tkinter import *
from PIL import ImageTk, Image
import os

class Application(Frame):
def __init__(self, parent):
Frame.__init__(self,parent)
self.pack(fill=BOTH, expand=True)

self.create_Menu()
self.create_widgets()

def create_Menu(self):
self.menuBar = Menu(self)

self.fileMenu = Menu(self.menuBar, tearoff=0)
self.fileMenu.add_command(label="Open", command=self.getImage)
self.fileMenu.add_separator()
self.fileMenu.add_command(label="Exit", command=self.exitProgram)

self.menuBar.add_cascade(label="File", menu=self.fileMenu)

root.config(menu=self.menuBar)

def create_widgets(self):
self.viewWindow = Canvas(self, bg="white")
self.viewWindow.pack(side=TOP, fill=BOTH, expand=True)

def getImage(self):
imageFile = Image.open("C:/Users/Public/Pictures/Sample Pictures/Desert.jpg")
imageFile = ImageTk.PhotoImage(imageFile)

self.viewWindow.image = imageFile
self.viewWindow.create_image(0, 0, anchor=CENTER, image=imageFile, tags="bg_img")

def exitProgram(self):
os._exit(0)

root = Tk()
root.title("Photo Zone")
root.wm_state('zoomed')

app = Application(root)

root.mainloop()

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