title: Inverted colours in tiff to PDF conversion
body: <p>I'm sure I'm making some kind of silly mistake here, but when converting a tiff file to PDF, the colours become reversed. I can't figure out why. Here's my code:</p>
  
  <pre><code>Document document = new Document(PageSize.A4, 50, 50, 50, 50);
  
  PdfWriter writer = PdfWriter.GetInstance(document, new FileStream("Image.pdf", FileMode.Create));
  
  System.Drawing.Bitmap bm = new System.Drawing.Bitmap(@"C:\Temp\338814-00.tif");
  int total = bm.GetFrameCount(FrameDimension.Page);                
  
  document.Open();
  PdfContentByte cb = writer.DirectContent;
  
  for (int k = 0; k &lt; total; ++k)
  {
   bm.SelectActiveFrame(FrameDimension.Page, k);
   MemoryStream ms = new MemoryStream();
   bm.Save(ms, ImageFormat.Tiff);
  
   Image img = Image.GetInstance(ms.ToArray());
  
   img.ScalePercent(72f / (float)img.DpiX * 100);
   img.SetAbsolutePosition(0, 0);
  
   cb.AddImage(img);
   document.NewPage();     
  }
  document.Close();
  </code></pre>
  
  <p>Thanks.</p>