title: Watermark in mPDF(PHP) not working correctly
body: <p>I have a strange problem with my php script using mPDF. I generate PDF file from HTML and I want to set watermark on each page. So I'm trying like in the manual:  </p>
  
  <pre><code>  if($_REQUEST['WATERMARK']==1){
          $mpdf-&gt;SetWatermarkText('draft');
          $mpdf-&gt;showWatermarkText = true;
          $mpdf-&gt;watermarkTextAlpha= 0.4;
      }
  </code></pre>
  
  <p>but it's working wrong because it set me watermark without clarity (like I will set watermarkTextAlpha= 1, overlaps on main text). But in other script (a little different) it works good. </p>