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This class is used to represent the size of a region in an image.


#include "itkSize.h"

int main(int, char *[])
  itk::Size<2> size;
  // You will often get this type from an image type. That is, ImageType::SizeType rather than itk::Size<2> explicitly.

  // Method 1 - set both components (size[0] and size[1]) to the same value (in this case, 0).
  std::cout << size << std::endl;

  // Method 2 - set each component separately.
  size[0] = 1;
  size[1] = 2;

  std::cout << size << std::endl;

  return EXIT_SUCCESS;


cmake_minimum_required(VERSION 3.9.5)


find_package(ITK REQUIRED)
if (ITKVtkGlue_LOADED)
  find_package(VTK REQUIRED)

add_executable(Size MACOSX_BUNDLE Size.cxx)

  target_link_libraries(Size ITKReview ${ITK_LIBRARIES})
  target_link_libraries(Size ${ITK_LIBRARIES})
endif( "${ITK_VERSION_MAJOR}" LESS 4 )

Download and Build Size

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

cd Size/build
  • If ITK is installed:
cmake ..
  • If ITK is not installed but compiled on your system, you will need to specify the path to your ITK build:
cmake -DITK_DIR:PATH=/home/me/itk_build ..

Build the project:


and run it:


WINDOWS USERS PLEASE NOTE: Be sure to add the ITK bin directory to your path. This will resolve the ITK dll's at run time.

Building All of the Examples

Many of the examples in the ITK Wiki Examples Collection require VTK. You can build all of the the examples by following these instructions. If you are a new VTK user, you may want to try the Superbuild which will build a proper ITK and VTK.


ITK >= 4

For examples that use QuickView (which depends on VTK), you must have built ITK with Module_ITKVtkGlue=ON.

ITK < 4

Some of the ITK Examples require VTK to display the images. If you download the entire ITK Wiki Examples Collection, the ItkVtkGlue directory will be included and configured. If you wish to just build a few examples, then you will need to download ItkVtkGlue and build it. When you run cmake it will ask you to specify the location of the ItkVtkGlue binary directory.