title: Python PIL image split to RGB
body: <p>How to split image to RGB colors and why doesn't <code>split()</code> function work?</p>
  
  <pre><code>from PIL import Image
  pil_image = Image.fromarray(some_image)
  red, green, blue = pil_image.split()
  red.show()
  </code></pre>
  
  <p>Why does <code>red.show()</code> shows image in greyscale instead of red scale?</p>
  
  <p>PS. The same situation using <code>green.show()</code> and <code>blue.show()</code>.</p>