GUI Progress Bar

[Anysja]

Thank you so much, that works beautifully on its own. I have another question. I have a class (shown below*) that I am trying to implement this class in. While the CreatingFinalImage() function is running, I want this progress bar to run. How can I do that?

*Note: I only showed a snippet of my code as it is 1100 lines long

class Window(Frame): #Frame is something inside of tkinter
    def __init__(self, master = None):
        Frame.__init__(self, master)
        self.init_window()
    def CreatingFinalImage(self):
        load2 = Image.open(self.picture1) #open the image
        blur = load2.filter(ImageFilter.GaussianBlur(radius=self.blur.get())) #this is a blur function, it makes the spots in the image diminish
        brightness = ImageEnhance.Brightness(blur)
        brightness = brightness.enhance(self.brightness.get()) #this is a brightness function, it brightens the image obviously