title: Why do I get an all-black/grayscale image when I load this PNG in MATLAB?
body: <p>When I run this code:</p>
  
  <pre><code>&gt;&gt; I = imread('D:\Works\matlab\SecCode.php.png','png');
  &gt;&gt; imshow(I);
  </code></pre>
  
  <p>It always shows an all-black image. What's wrong with it?</p>
  
  <p>The image I'm using is this one:</p>
  
  <p><a href="https://i.stack.imgur.com/jre74.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/jre74.png" alt="enter image description here"></a></p>