title: Why does image scale not work in reStructuredText when generating html files?
body: <p>I use reStructuredText to generate my static blog web pages. And I use the command below to include an image:</p>
  
  <pre><code>.. image:: /images/01.jpg
     :scale: 50
     :align: center 
  </code></pre>
  
  <p>However, the image displayed on my blog web page remain the same size as the original image. Seems that the <code>scale</code> option does not work. So, how to solve this problem?</p>