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¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
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 PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.