Extract Image from a particular page in PDF

Question

I want to extract an Image from a PDF file. I tried with the following code and it extracted a jpeg Image perfectly from the PDF. The problem is how to extract image from a

Answer 1

The following code works fine to extract image from particular page.

using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using iTextSharp.text.pdf.parser;
using Dotnet = System.Drawing.Image;
using iTextSharp.text.pdf;
namespace PDF_Parsing
{
  partial class PDF_ImgExtraction
  {
    string imgPath;
    private void ExtractImage(string pdfFile)
    {
      const int pageNumber = 1;//Page number to extract the image from
      PdfReader pdf = new PdfReader(pdfFile);
      PdfDictionary pg = pdf.GetPageN(pageNumber);
      PdfDictionary res = (PdfDictionary)PdfReader.GetPdfObject(pg.Get(PdfName.RESOURCES));
      PdfDictionary xobj = (PdfDictionary)PdfReader.GetPdfObject(res.Get(PdfName.XOBJECT));
      foreach (PdfName name in xobj.Keys)
      {
        PdfObject obj = xobj.Get(name);
        if (obj.IsIndirect())
        {
          PdfDictionary tg = (PdfDictionary)PdfReader.GetPdfObject(obj);
          string width = tg.Get(PdfName.WIDTH).ToString();
          string height = tg.Get(PdfName.HEIGHT).ToString();
          ImageRenderInfo imgRI = ImageRenderInfo.CreateForXObject(new Matrix(float.Parse(width), float.Parse(height)), (PRIndirectReference)obj, tg);
          RenderImage(imgRI);
        }
      }
    }
    private void RenderImage(ImageRenderInfo renderInfo)
    {
      PdfImageObject image = renderInfo.GetImage();
      using (Dotnet dotnetImg = image.GetDrawingImage())
      {
        if (dotnetImg != null)
        {
          using (MemoryStream ms = new MemoryStream())
          {
            dotnetImg.Save(ms, ImageFormat.Tiff);
            Bitmap d = new Bitmap(dotnetImg);
            d.Save(imgPath);
          }
        }
      }
    }
  }
}