title: cannot read in image in colour in opencv python
body: <p>I have just started to use Opencv using python in windows(PyCharm IDE).
  I tried to read a color image. But it got displayed in Grayscale. So I tried to convert it as below:</p>
  
  <pre><code>import cv2
  img = cv2.imread('C:\Ai.jpg', 0)
  b,g,r = cv2.split(img)
  rgb = cv2.merge([r,g,b])
  cv2.imshow('image', img)
  cv2.imshow('rgb image',rgb)
  cv2.waitKey(0)
  cv2.destroyAllWindows()
  </code></pre>
  
  <p>But i am getting an error:</p>
  
  <blockquote>
    <p>"b, g, r = cv2.split(img) ValueError: need more than 1 value to
    unpack"</p>
  </blockquote>
  
  <p>Can you guys please help me out?
  Thanks in advance.</p>