private byte[] addSignature(iTextSharp.text.Image gif, int pageNumber, double x, double y, string headerSignature)
{
//gif.ScalePercent(70f);
gif.ScaleAbsolute(88.2f, 62.3f);
gif.SetAbsolutePosition(Convert.ToInt64(x), Convert.ToInt64(y));
return InsertImage(_pdfFile, gif, pageNumber, x, y, headerSignature);
}