TCPDF ERROR: [Image] Unable to get the size of the image
<p>We are using a extension for Magento which generates PDFs for orders based on php (phtml) templates.</p>

<p>I've customised it a bit and am getting the bellow error</p>

<blockquote>
  <p>a:5:{i:0;s:149:"TCPDF ERROR: [Image] Unable to get the size of the image: <a href="http://example.com/skin/frontend/my-package/default/images/packing-slip-logo.jpg" rel="nofollow">http://example.com/skin/frontend/my-package/default/images/packing-slip-logo.jpg</a>";i:1;s:1193:"#0 /var/www/example/lib/tcpdf/tcpdf.php(6884): TCPDF->Error()</p>
</blockquote>

<p>This is how I'm adding the image:</p>

<pre><code>&lt;img width="900" style="width: 900px; margin: 0; padding: 0" src="&lt;?php echo Mage::getBaseUrl('skin'); ?&gt;frontend/my-package/default/images/packing-slip-logo.jpg" /&gt;
</code></pre>

<p>Am I missing something obvious on how I should add the image?</p>