# ImageExport

VTKExamples/Cxx/Images/ImageExport

### Code

ImageExport.cxx

    #include <vtkImageData.h>
    #include <vtkImageExport.h>
    #include <vtkSmartPointer.h>
    #include <vtkVersion.h>

    int main(int, char *[])
    {
      // Create an image data
      vtkSmartPointer<vtkImageData> imageData =
        vtkSmartPointer<vtkImageData>::New();

      // Specify the size of the image data
      int dims[3] = {2,3,1};

      imageData->SetDimensions(dims[0], dims[1], dims[2]);
    #if VTK_MAJOR_VERSION <= 5
      imageData->SetNumberOfScalarComponents(1);
      imageData->SetScalarTypeToUnsignedChar();
    #else
      imageData->AllocateScalars(VTK_UNSIGNED_CHAR,1);
    #endif

      unsigned char value = 0;
      for(int row = 0; row < dims[0]; ++row)
      {
        for(int col = 0; col < dims[1]; ++col)
        {
          unsigned char* pixel =
            static_cast<unsigned char*>(imageData->GetScalarPointer(row, col, 0));
          pixel[0] = value;
          value += 10;
        }
      }

      // Create the c-style image to convert the VTK image to
      unsigned char *cImage = new unsigned char[dims[0]*dims[1]*dims[2]];

      vtkSmartPointer<vtkImageExport> exporter =
        vtkSmartPointer<vtkImageExport>::New();
    #if VTK_MAJOR_VERSION <= 5
      exporter->SetInput(imageData);
    #else
      exporter->SetInputData(imageData);
    #endif
      exporter->ImageLowerLeftOn();
      exporter->Update();
      exporter->Export(cImage);

      // Output the raw c-style image
      for(int row = 0; row < dims[0]; ++row)
      {
        for(int col = 0; col < dims[1]; ++col)
        {
          std::cout << static_cast<int>(cImage[col * dims[0] + row]) << " ";
        }
        std::cout << std::endl;
      }
      delete [] cImage;

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(ImageExport)

    find_package(VTK REQUIRED)
    include(${VTK_USE_FILE})

    add_executable(ImageExport MACOSX_BUNDLE ImageExport.cxx )

    target_link_libraries(ImageExport ${VTK_LIBRARIES})

### Download and Build ImageExport

Click here to download ImageExport and its CMakeLists.txt file. Once the tarball ImageExport.tar has been downloaded and extracted,

    cd ImageExport/build

If VTK is installed:

    cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

    cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Build the project:

    make

and run it:

    ./ImageExport

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.