Tkinter Reloading Window displaying an Image

[Peter Kr]

Hi,
I've been searching for this on google for a while, but I didn't find anything.
I want to display an Image inside a Tkinter Window, but the Window should refresh the image every second or so.
How do I do that?
My Code so far:

import Tkinter 
import Image, ImageTk

im = Image.open('temp.png')

root = Tkinter.Tk()
tkimage = ImageTk.PhotoImage(im)

Tkinter.Label(root, image=tkimage).pack()

def update_image():
    im = None
    tkimage = None
    Tkinter.Label.destroy()
    im = Image.open('temp.png')
    tkimage = ImageTk.PhotoImage(im)
    Tkinter.Label(root, image=tkimage).pack()
    root.geometry('%dx%d' % (im.size[0],im.size[1]))
    root.after(1000, update_image)
root.after(1000, update_image)
root.mainloop()

[dwblas]

You would open a bunch of images at the beginning of the program and place them into a list. The function would randomly select an image and display it. You should also save the id of the label so you can configure it in the function instead of creating a new label,

lab_1=Tkinter.Label(root, image=tkimage)
lab_1.pack()

def update_image():
    ...
    ##Tkinter.Label(root, image=tkimage).pack()
    ## replace with something like the following
    new_image=random.choice(image_list)
    lab_1.config(image=new_image)

[Peter Kr]

My Problem is that I want to update the image, so if I would for example edit the image, it would change in the window with the next update.

[Peter Kr]

You would open a bunch of images at the beginning of the program and place them into a list. The function would randomly select an image and display it. You should also save the id of the label so you can configure it in the function instead of creating a new label,

lab_1=Tkinter.Label(root, image=tkimage)
lab_1.pack()

def update_image():
    ...
    ##Tkinter.Label(root, image=tkimage).pack()
    ## replace with something like the following
    new_image=random.choice(image_list)
    lab_1.config(image=new_image)

I changed the code to this:

import Tkinter 
import Image, ImageTk
im = Image.open('temp.png')

def update_image():
    im = Image.open('temp.png')
    tkimage = ImageTk.PhotoImage(im)
    label.config(image=tkimage)
    root.geometry('%dx%d' % (im.size[0],im.size[1]))
    root.after(1000, update_image)
    
root = Tkinter.Tk()
im = Image.open('temp.png')
tkimage = ImageTk.PhotoImage(im)
label =  Tkinter.Label(root, image=tkimage)
label.pack()
root.after(1000, update_image)
root.mainloop()

but now, as soon as it updates, the window displays a grey background, but no picture. What'd I do wrong?
Thanks for helping btw ;)

[dwblas]

The variable tkimage is created in a function, which means it is local to the function and so is garbage collected when you exit the function, so no image to display. Keep a reference to it. You really should start learning classes as it makes keeping track of variables much easier.

def update_image():
     im = Image.open('temp.png')

     tkimage = ImageTk.PhotoImage(im)
     label.tkimage=tkimage     ## keep in instance of label
     # or just
     # label.tkimage = ImageTk.PhotoImage(im)

     label.config(image=label.tkimage)
     root.geometry('%dx%d' % (im.size[0],im.size[1]))
     root.after(1000, update_image)

[Peter Kr]

The variable tkimage is created in a function, which means it is local to the function and so is garbage collected when you exit the function, so no image to display. Keep a reference to it. You really should start learning classes as it makes keeping track of variables much easier.

def update_image():
     im = Image.open('temp.png')

     tkimage = ImageTk.PhotoImage(im)
     label.tkimage=tkimage     ## keep in instance of label
     # or just
     # label.tkimage = ImageTk.PhotoImage(im)

     label.config(image=label.tkimage)
     root.geometry('%dx%d' % (im.size[0],im.size[1]))
     root.after(1000, update_image)

Oh, right :/
I am quite common with classes, but tkinter is like a whole new language to me xD
Thanks, I'll try it as soon as possible :)

[bvdet]

dwblas gave you good advice regarding classes. Another possibility is to create a reference to the image with the global keyword.

def update_image():
    global tkimg1
    tkimg1 = ImageTk.PhotoImage(Image.open(file_name))
    w.config(image=tkimg1)
    w.after(1000, update_image)

[Peter Kr]

Thanks a lot both of you, works now!!!

import Tkinter 
import Image, ImageTk

def update_image():
        global tkimg1
        tkimg1 = ImageTk.PhotoImage(Image.open('temp.png'))
        label.config( image = tkimg1)
        label.after(1000, update_image)
        print "Updated"


    
w = Tkinter.Tk()
im = Image.open('temp.png')
tkimg1 = ImageTk.PhotoImage(im)
label =  Tkinter.Label(w, image=tkimg1)
print "Loaded"
label.pack()
w.after(1000, update_image)
w.mainloop()