# CompressImage.cxx

    /*=========================================================================

      Program: GDCM (Grassroots DICOM). A DICOM library
      Module:  $URL$

      Copyright (c) 2006-2010 Mathieu Malaterre
      All rights reserved.
      See Copyright.txt or http://gdcm.sourceforge.net/Copyright.html for details.

         This software is distributed WITHOUT ANY WARRANTY; without even
         the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
         PURPOSE.  See the above copyright notice for more information.

    =========================================================================*/
    /*
     *
     */

    #include "gdcmImageReader.h"
    #include "gdcmImage.h"
    #include "gdcmWriter.h"
    #include "gdcmAttribute.h"
    #include "gdcmImageWriter.h"
    #include "gdcmImageChangeTransferSyntax.h"

    #include <iostream>
    #include <fstream>

    int main(int argc, char *argv[])
    {
      if( argc < 3 )
        {
        std::cerr << argv[0] << " input.dcm output.dcm" << std::endl;
        return 1;
        }
      const char *filename = argv[1];
      const char *outfilename = argv[2];

      gdcm::ImageReader reader;
      reader.SetFileName( filename );
      if( !reader.Read() )
        {
        std::cerr << "Could not read: " << filename << std::endl;
        return 1;
        }

      // The output of gdcm::Reader is a gdcm::File
      gdcm::File &file = reader.GetFile();

      // the dataset is the the set of element we are interested in:
      gdcm::DataSet &ds = file.GetDataSet();

      const gdcm::Image &image = reader.GetImage();
      image.Print( std::cout );

      gdcm::ImageChangeTransferSyntax change;
      change.SetTransferSyntax( gdcm::TransferSyntax::JPEG2000Lossless );
      change.SetTransferSyntax( gdcm::TransferSyntax::JPEGLosslessProcess14_1 );
      //change.SetTransferSyntax( image.GetTransferSyntax() );
      change.SetInput( image );
      bool b = change.Change();
      if( !b )
        {
        std::cerr << "Could not change the Transfer Syntax" << std::endl;
        return 1;
        }

      //std::ofstream out( outfilename );
      //image.GetBuffer2(out);
      //out.close();
      gdcm::ImageWriter writer;
      writer.SetImage( change.GetOutput() );
      writer.SetFile( reader.GetFile() );
      writer.SetFileName( outfilename );
      if( !writer.Write() )
        {
        return 1;
        }

      return 0;
    }