public void saveImageExistingMultiplePage(Image origionalFile, string type, int PageNumber, string location,long col1,float dpi)

        {

            //Now load the Codecs 

            ImageCodecInfo codecInfo = getCodecForstring(type);



            EncoderParameter SaveEncodeParam;

            EncoderParameter CompressionEncodeParam;

            EncoderParameters EncoderParams = new EncoderParameters(3);

            EncoderParameter ColorEncodeParam;



            Bitmap pages;

            Bitmap NextPage;



            origionalFile.SelectActiveFrame(FrameDimension.Page, 0);

            pages = new Bitmap(origionalFile);

            pages = ConvertToBitonal(pages,dpi);



            // Save the first page (frame).

            SaveEncodeParam = new EncoderParameter(System.Drawing.Imaging.Encoder.SaveFlag, (long)EncoderValue.MultiFrame);

            CompressionEncodeParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Compression, (long)EncoderValue.CompressionNone);

            // Save the image with a color depth of 24 bits per pixel.

            ColorEncodeParam = new EncoderParameter(System.Drawing.Imaging.Encoder.ColorDepth, col1);

            EncoderParams.Param[0] = CompressionEncodeParam;

            EncoderParams.Param[1] = SaveEncodeParam;

            EncoderParams.Param[2] = ColorEncodeParam;



            pages.Save(location, codecInfo, EncoderParams);



            for (int i = 1; i < PageNumber; i++)

            {

                SaveEncodeParam = new EncoderParameter(System.Drawing.Imaging.Encoder.SaveFlag, (long)EncoderValue.FrameDimensionPage);

                CompressionEncodeParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Compression, (long)EncoderValue.CompressionNone);

                EncoderParams.Param[0] = CompressionEncodeParam;

                EncoderParams.Param[1] = SaveEncodeParam;

                EncoderParams.Param[2] = ColorEncodeParam;



                origionalFile.SelectActiveFrame(FrameDimension.Page, i);

                NextPage = new Bitmap(origionalFile);

                NextPage = ConvertToBitonal(NextPage,dpi);

                pages.SaveAdd(NextPage, EncoderParams);

            }

            SaveEncodeParam = new EncoderParameter(System.Drawing.Imaging.Encoder.SaveFlag, (long)EncoderValue.Flush);

            EncoderParams.Param[0] = SaveEncodeParam;

            pages.SaveAdd(EncoderParams);

        }



        public int getPageNumber(Image img)

        {

            Guid objGuid = img.FrameDimensionsList[0];

            FrameDimension objDimension = new FrameDimension(objGuid);



            //Gets the total number of frames in the .tiff file

            int PageNumber = img.GetFrameCount(objDimension);



            return PageNumber;

        }