"""Draw on top of an image""" from Tkinter import * import sys def main(): filename = sys.argv[1] root = Tk() img = PhotoImage(file=filename) w, h = img.width(), img.height() canv = Canvas(root, width=w, height=h) canv.create_image(0, 0, anchor=NW, image=img) canv.pack() canv.bind('', blob) root.mainloop() def blob(event): x, y = event.x, event.y canv = event.widget r = 5 canv.create_oval(x-r, y-r, x+r, y+r, fill='red', outline="") main()