title: Python won't identify 'imread' function
body: <p>I am using Python 2.7 on Ubuntu and I was experimenting with images before beginning an assignment for my algorithms class. I have downloaded numpy, scipy and skimage packages and I keep getting the error that 'imread' 'title' and these inbuilt functions are undefined. Any idea what could be wrong?</p>
  
  <pre><code>   from pylab import *
     from skimage import img_as_float
  
     img = imread(‘someimage.png’)
     img = img_as_float(img)
     w, h = img.shape[:2]
     R = img[:,:,0]
     G = img[:,:,1]
     B = img[:,:,2]
     figure()
     gray()
     subplot(1,4,1); imshow(img); title(“RGB”)
     subplot(1,4,2); imshow(R); title(“Red”)
     subplot(1,4,3); imshow(G); title(“Green”)
     subplot(1,4,4); imshow(B); title(“Blue”)
     show()   
  </code></pre>