title: Getting a sublist that has 4 element
body: <p>Here is the code. The length of the sublist should be 3 (RGB). But I got 4.</p>
  <pre><code>import numpy as np
  from PIL import Image
  
  with Image.open(&quot;hash security.png&quot;) as img:
      width, height = img.size
      arr=list(img.getdata())
      print(arr)
  </code></pre>
  <p>Here is a snippet output.</p>
  <pre><code>[(255, 255, 255, 255), (255, 255, 255, 255), (255, 255, 255, 255)]
  </code></pre>