title: iTextsharp - PDF file size after inserting image
body: <p>I'm currently converting some legacy code to create PDF files using iTextSharp.  We're creating a largish PDF file that contains a number of images, which I'm inserting like so:</p>
  
  <pre><code>Document doc = new Document(PageSize.A4, 50, 50, 25, 25);
  PdfWriter writer = PdfWriter.GetInstance(doc, myStream);
  
  writer.SetFullCompression();
  
  doc.Open();
  
  Image frontCover = iTextSharp.text.Image.GetInstance(@"C:\MyImage.png");
  
  //Scale down from a 96 dpi image to standard itextsharp 72 dpi
  frontCover.ScalePercent(75f);
  
  frontCover.SetAbsolutePosition(0, 0);
  
  doc.Add(frontCover);
  
  doc.Close();
  </code></pre>
  
  <p>Inserting an image (20.8 KB png file) seems to increase the PDF file size by nearly 100 KB.</p>
  
  <p>Is there a way of compressing the image before entry (bearing in mind that this needs to be of reasonable print quality), or of further compressing the entire PDF?  Am I even performing any compression in the above example?</p>