ITK/Examples/SimpleOperations/Transparency

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This example demonstrates how to assign transparency to pixels in an image. It then writes the result to a tif file for inspection and verification.

(I don't think QuickView can handle this example - the transparency would be lost).

Transparency.cxx

#include "itkImage.h"
#include "itkImageFileWriter.h"
#include "itkImageRegionIterator.h"
#include "itkTIFFImageIO.h"
#include "itkRGBAPixel.h"
 
int main(int argc, char *argv[])
{
  std::string outputFilename;
  if(argc > 1)
    {
    outputFilename = argv[1];
    }
  else
    {
    outputFilename = "test.tif";
    }
 
  typedef itk::RGBAPixel<unsigned char> PixelType;
  typedef itk::Image< PixelType, 2>  ImageType;
 
  ImageType::RegionType region;
  ImageType::IndexType start;
  start[0] = 0;
  start[1] = 0;
 
  ImageType::SizeType size;
  size[0] = 200;
  size[1] = 300;
 
  region.SetSize(size);
  region.SetIndex(start);
 
  ImageType::Pointer image = ImageType::New();
  image->SetRegions(region);
  image->Allocate();
 
  itk::ImageRegionIterator<ImageType> imageIterator(image,region);
 
  while(!imageIterator.IsAtEnd())
    {
    ImageType::PixelType pixel = imageIterator.Get();
 
    if(imageIterator.GetIndex()[0] > 100)
      {
      pixel.SetRed(0);
      pixel.SetGreen(255);
      pixel.SetBlue(0);
      //pixel.SetAlpha(255); // invisible
      pixel.SetAlpha(122);
      }
    else
      {
      pixel.SetRed(255);
      pixel.SetGreen(0);
      pixel.SetBlue(0);
      pixel.SetAlpha(0.5);
      }
    imageIterator.Set(pixel);
 
    ++imageIterator;
  }
 
  typedef  itk::ImageFileWriter< ImageType  > WriterType;
  typedef  itk::TIFFImageIO TIFFIOType;
  WriterType::Pointer writer = WriterType::New();
  TIFFIOType::Pointer tiffIO = TIFFIOType::New();
  tiffIO->SetPixelType(itk::ImageIOBase::RGBA);
  writer->SetFileName(outputFilename);
  writer->SetInput(image);
  writer->SetImageIO(tiffIO);
  writer->Update();
 
  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
 
project(Transparency)
 
find_package(ITK REQUIRED)
include(${ITK_USE_FILE})
 
add_executable(Transparency Transparency.cxx)
 
if( "${ITK_VERSION_MAJOR}" LESS 4 )
  target_link_libraries(Transparency ITKReview ${ITK_LIBRARIES})
else( "${ITK_VERSION_MAJOR}" LESS 4 )
  target_link_libraries(Transparency ${ITK_LIBRARIES})
endif( "${ITK_VERSION_MAJOR}" LESS 4 )
Retrieved from "http://www.itk.org/Wiki/ITK/Examples/SimpleOperations/Transparency"
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