title: Add an image to an existing PDF file with iText7
body: <p>I want to add an image to a specific position inside an existing PDF file using iText7.<br>
  In a different project using iTextSharp, the code was very simple:</p>
  
  <pre><code>iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance(new Uri(fullPathSignature));
  // Set img size and location on page
  //-------------------------------------
  // item.Width, item.Height
  img.ScaleAbsolute(120, 62);
  
  // left: item.X bottom: item.Y
  img.SetAbsolutePosition(25, 25);
  //-------------------------------------
  
  //Add it to page 1 of the document,
  PdfContentByte cb = stamper.GetOverContent(1);
  cb.AddImage(img);
  </code></pre>
  
  <p>But I do not find the correct way to do it with iText7.<br>
  I have a PdfReader and a PdfWriter but where can I find the PdfStamper in iText7?<br>
  Or maybe there is a different way to add an image to an existing PDF file in iText7?<br>
  (I can't use iTextSharp in current project)</p>