"Parameter is not valid" error when extracting images using iTextSharp from a PDF containing JPXDecode filter

Question

I am trying to extract images from a PDF using the following code. It works well for some filters like DCTDecode , but is not working for JPXDEcode ."Parameter not valid " error occurs at the point image.GetDrawingImage() is called.

 using System.Drawing.Imaging;
    using iTextSharp.text.pdf;
    using iTextSharp.text.pdf.parser;
    ...
    PdfReader pdf = new PdfReader(currfilename);
     PdfReaderContentParser parser = new PdfReaderContentParser(pdf);
     ImageRender listener = new ImageRender();
     for (int i = 1; i <= pdf.NumberOfPages; i++)
     {
          try
          {
              parser.ProcessContent(i, listener);//calls RenderImage() at this point

           }
           catch (Exception e)
           {
                Console.WriteLine(e);
           }

      }


    public void RenderImage(ImageRenderInfo renderInfo)
            {
                PdfImageObject image = renderInfo.GetImage();
                PdfName filter = image.Get(PdfName.FILTER) as PdfName;


                if (renderInfo.GetRef() != null && image != null)
                {
                    using (System.Drawing.Image dotnetImg = image.GetDrawingImage())//exception occurs at this point
                    {
                        if (dotnetImg != null)
                        {
                            ImageNames.Add(string.Format("{0}.tiff", renderInfo.GetRef().Number));
                            using (MemoryStream ms = new MemoryStream())
                            {
                                dotnetImg.Save(ms, ImageFormat.Tiff);
                                Images.Add(ms.ToArray());
                            }
                        }
                    }
                }



            }

I tried these links for a solution

Extract images using iTextSharp

Extract Image from a particular page in PDF

and was able to extract the raw image bytes using PdfReader.GetStreamBytesRaw() function but "Parameter not valid "exception always occurs at the point where System.Drawing.Image.FromStream(memory stream) is called.

I also checked this link "Parameter is not valid" exception from System.Drawing.Image.FromStream() method , but could not find anything helpful.

Please help

Answer 1

Using FreeImage.dll solved the problem. The code is as follows

using FreeImageAPI;
using System.Drawing.Imaging;
using iTextSharp.text.pdf;
using iTextSharp.text.pdf.parser;
...
        imagecount = 0;
        PdfReader pdf = new PdfReader(currfilename);
        PdfReaderContentParser parser = new PdfReaderContentParser(pdf);
        ImageRender listener = new ImageRender();
        for (int i = 1; i <= pdf.NumberOfPages; i++)
        {
         try
            {
                  parser.ProcessContent(i, listener);//calls RenderImage() at this point
            }
         catch (Exception e)
         {
             Console.WriteLine(e);
         }

       }
       if (listener.Images.Count > 0)
       {
           for (int j = 0; (j < listener.Images.Count); ++j)
           {
              string imgpath = Environment.CurrentDirectory.ToString() +  "\\Image" + imagecount + ".bmp";

              // create a memory stream
              MemoryStream imageStream = new MemoryStream(listener.Images[j]);
              // create a FIBITMAP from that stream
              FIBITMAP dib = FreeImage.LoadFromStream(imageStream);

              if (dib.IsNull) continue;
             //turn it into a normal Bitmap 
             Bitmap bitmap = FreeImage.GetBitmap(dib);
             bitmap.Save(imgpath);
             //unload the FIBITMAP 
             FreeImage.UnloadEx(ref dib);
             bitmap.Dispose();

             System.Drawing.Image img = System.Drawing.Image.FromFile(imgpath);



           }





  public void RenderImage(ImageRenderInfo renderInfo)
 {
    PdfImageObject image = renderInfo.GetImage();    
    if (renderInfo.GetRef() != null && image != null)
    {

      byte[] tempImage = image.GetImageAsBytes();                                  
      ImageNames.Add(string.Format("0}.bmp",renderInfo.GetRef().Number));
      Images.Add(tempImage);

     }             


}

I followed the instructions given here to add FreeImage .Net to solution

Answer 2

The JPXDecode filter corresponds to JPEG 2000 compression, which is not supported by .net framework. This other question in SO may help: JPEG 2000 support in C#.NET