title: How to disable image stretching In the application kivy-example/demo/pictures/main.py
body: <p>Kivy is provided with some demo. In one of them kivy-example/demo/pictures/main.py, some images can moved and stretched. I <a href="http://dip4fish.blogspot.fr/2013/08/moving-chromosomes-with-kivy.html" rel="nofollow noreferrer">started to modify this app</a> . My question is how to disable image stretching ?</p>
  <p>Thanks</p>