ITK/Examples/SimpleOperations/ScalarToRGBColormapImageFilter

ScalarToRGBColormapImageFilter.cxx

<source lang="cpp">

1. include "itkImage.h"
2. include "itkImageRegionConstIterator.h"
3. include "itkScalarToRGBColormapImageFilter.h"
4. include "itkRescaleIntensityImageFilter.h"
5. include "itkImageFileWriter.h"
6. include "itkRGBPixel.h"

typedef itk::RGBPixel<unsigned char> RGBPixelType; typedef itk::Image<RGBPixelType, 2> RGBImageType;

typedef itk::Image<float, 2> FloatImageType; typedef itk::Image<unsigned char, 2> UnsignedCharImageType;

int main( int argc, char *argv[]) {

 FloatImageType::Pointer image = FloatImageType::New();

 itk::Index<2> start;
 start.Fill(0);

 itk::Size<2> size;
 size.Fill(20);

 itk::ImageRegion<2> region(start, size);

 image->SetRegions(region);
 image->Allocate();

 for(unsigned int i = 0; i < 20; i++)
   {
   for(unsigned int j = 0; j < 20; j++)
     {
     itk::Index<2> pixel;
     pixel[0] = i;
     pixel[1] = j;
     image->SetPixel(pixel, j);
     }
   }

 typedef itk::RescaleIntensityImageFilter< FloatImageType, UnsignedCharImageType > RescaleFilterType;
 RescaleFilterType::Pointer rescaleFilter = RescaleFilterType::New();
 rescaleFilter->SetInput(image);
 rescaleFilter->SetOutputMinimum(0);
 rescaleFilter->SetOutputMaximum(255);
 rescaleFilter->Update();

 {
 typedef  itk::ImageFileWriter< UnsignedCharImageType > WriterType;
 WriterType::Pointer writer = WriterType::New();
 writer->SetFileName("original.png");
 writer->SetInput(rescaleFilter->GetOutput());
 writer->Update();
 }

 typedef itk::ScalarToRGBColormapImageFilter<FloatImageType, RGBImageType> RGBFilterType;
 RGBFilterType::Pointer rgbfilter = RGBFilterType::New();
 rgbfilter->SetInput(image);
 rgbfilter->SetColormap( RGBFilterType::Hot );

 {
 typedef  itk::ImageFileWriter< RGBImageType > WriterType;
 WriterType::Pointer writer = WriterType::New();
 writer->SetFileName("hot.png");
 writer->SetInput(rgbfilter->GetOutput());
 writer->Update();
 }

 return EXIT_SUCCESS;

}

</source>

CMakeLists.txt

<source lang="cmake"> cmake_minimum_required(VERSION 2.6)

PROJECT(ScalarToRGBColormapImageFilter)

FIND_PACKAGE(ITK REQUIRED) INCLUDE(${ITK_USE_FILE})

ADD_EXECUTABLE(ScalarToRGBColormapImageFilter ScalarToRGBColormapImageFilter.cxx) TARGET_LINK_LIBRARIES(ScalarToRGBColormapImageFilter ITKIO)

</source>