title: crop image in skimage?
body: <p>I'm using skimage to crop a rectangle in a given image, now I have (x1,y1,x2,y2) as the rectangle coordinates, then I had loaded the image </p>
  
  <pre><code> image = skimage.io.imread(filename)
   cropped = image(x1,y1,x2,y2)
  </code></pre>
  
  <p>However this is the wrong way to crop the image, how would I do it in the right way in skimage</p>