title: imadjust turns all pixels to white
body: <p>I am using <code>imadjust</code> to enhance image contrast or to stretch, for example:</p>
  
  <pre><code>image = imread(path)
  result = imadjust(image, [0.01 0.6], []);
  </code></pre>
  
  <p>but it turns all image pixels to white. How do I fix it?</p>