title: Change the content of an image field
body: <p>I just want to use <code>node_save()</code> to change value of an image field in my article, and I am using the following code.</p>
  
  <pre><code>$node = node_load(1);
  $node-&gt;field_image["und"][0]["filename"] = $file_name;
  node_save($node);
  </code></pre>
  
  <p>When I press F5, the image in my article is not changed.</p>
  
  <p>Is anything wrong in my code?</p>