/// <summary>
        /// Extracts text fragments from the 3rd page and highlights the glyphs in the fragment.
        /// </summary>
        /// <param name="document"></param>
        private static void ExtractImagesAndHighlight(PDFFixedDocument document)
        {
            PDFPen                     pen       = new PDFPen(new PDFRgbColor(255, 0, 192), 0.5);
            PDFBrush                   brush     = new PDFBrush(new PDFRgbColor(0, 0, 0));
            PDFStandardFont            helvetica = new PDFStandardFont(PDFStandardFontFace.Helvetica, 8);
            PDFStringAppearanceOptions sao       = new PDFStringAppearanceOptions();

            sao.Brush = brush;
            sao.Font  = helvetica;
            PDFStringLayoutOptions slo = new PDFStringLayoutOptions();

            slo.Width = 1000;

            PDFContentExtractor      ce  = new PDFContentExtractor(document.Pages[2]);
            PDFVisualImageCollection eic = ce.ExtractImages(false);

            for (int i = 0; i < eic.Count; i++)
            {
                string imageProperties = string.Format("Image ID: {0}\nPixel width: {1} pixels\nPixel height: {2} pixels\n" +
                                                       "Display width: {3} points\nDisplay height: {4} points\nHorizonal Resolution: {5} dpi\nVertical Resolution: {6} dpi",
                                                       eic[i].ImageID, eic[i].Width, eic[i].Height, eic[i].DisplayWidth, eic[i].DisplayHeight, eic[i].DpiX, eic[i].DpiY);

                PDFPath boundingPath = new PDFPath();
                boundingPath.StartSubpath(eic[i].ImageCorners[0].X, eic[i].ImageCorners[0].Y);
                boundingPath.AddLineTo(eic[i].ImageCorners[1].X, eic[i].ImageCorners[1].Y);
                boundingPath.AddLineTo(eic[i].ImageCorners[2].X, eic[i].ImageCorners[2].Y);
                boundingPath.AddLineTo(eic[i].ImageCorners[3].X, eic[i].ImageCorners[3].Y);
                boundingPath.CloseSubpath();

                document.Pages[2].Canvas.DrawPath(pen, boundingPath);
                slo.X = eic[i].ImageCorners[3].X + 1;
                slo.Y = eic[i].ImageCorners[3].Y + 1;
                document.Pages[2].Canvas.DrawString(imageProperties, sao, slo);
            }
        }
        static void Main(string[] args)
        {
            // Load the PDF file.
            //PDF4NET v5: PDFDocument doc = new PDFDocument("..\\SupportFiles\\Images.pdf");
            PDFFixedDocument doc = new PDFFixedDocument("..\\..\\..\\..\\..\\SupportFiles\\content.pdf");

            //for (int i = 0; i < doc.Pages.Count; i++)
            //{
            // Convert the pages to PDFImportedPage to get access to ExtractImages method.
            //PDF4NET v5: PDFImportedPage ip = doc.Pages[i] as PDFImportedPage;
            PDFContentExtractor ce = new PDFContentExtractor(doc.Pages[2]);
            //PDF4NET v5: Bitmap[] images = ip.ExtractImages();
            PDFVisualImageCollection images = ce.ExtractImages(true);

            // Save the page images to disk, if there are any.
            for (int j = 0; j < images.Count; j++)
            {
                //PDF4NET v5: images[j].Save("image" + i.ToString() + j.ToString() + ".png", ImageFormat.Png);
                FileStream fs = File.OpenWrite("image" + j.ToString() + ".png");
                images[j].Save(fs, PDFVisualImageSaveFormat.Png);
                fs.Flush();
                fs.Close();
            }
            //}
        }