title: pylab imshow color not fully showing
body: <p>I have been trying to implement some image processing techniques with an opened image via pylab. The problems is, I can open and see the image thru pylab, but the color seems to be very different. It doesn't seem that the red colors are displayed.</p>
  
  <blockquote>
    <p>The image shown with Pylab</p>
  </blockquote>
  
  <p><img src="https://i.stack.imgur.com/cEiav.jpg" alt=""></p>
  
  <blockquote>
    <p>The original image (and when it is shown with cv2.imshow</p>
  </blockquote>
  
  <p><img src="https://i.stack.imgur.com/XKMPp.jpg" alt=""></p>
  
  <p>Anyone can help me make pylab work appropriately? 
  Thank you very much!</p>