title: Is there way to return actual x,y-coordinates from the image?
body: <p>my dear py-experts.
  I wrote a GUI program in python (Tkinter library) which displays a picture, to display an image i used the Canvas widget. The program does load a picture (its width/height always bigger than Canvas width/height) and when i make a mouse click on the Canvas it returns a x,y - coordinates (and color grayscale value), but it always a coordinates of Canvas, not an image ones. For example - image sizes are x=5040 and y=3360 and Canvas widget sizes are x=500 and y=400 and when i making a click on Canvas i never get values,even if i scrolling image, more than 500 for X-axis and 400 for Y-axis respectively.  What i did wrong, how to get right information from the image?
  Thnx.</p>