#ifndef ITKVTKCOLORTRANSFERFUNCTION_TXX
#define ITKVTKCOLORTRANSFERFUNCTION_TXX

namespace itk{


template< class TypeImage>
VTKColorTransferFunction<TypeImage>::VTKColorTransferFunction()
{

}

template< class TypeImage>
VTKColorTransferFunction<TypeImage>::~VTKColorTransferFunction()
{
    m_Output->Delete();
}

template< class TypeImage>
void VTKColorTransferFunction<TypeImage>::Update(){
    GenerateOutputInformation();
    GenerateData();
}

template< class TypeImage>
void VTKColorTransferFunction<TypeImage>::GenerateOutputInformation(){
     m_Output = vtkColorTransferFunction::New();
}



template< class TypeImage>
void VTKColorTransferFunction<TypeImage>::GenerateData(){



    InputImagePointerType imagergb = this->GetInput();

    if(!imagergb){
        itkExceptionMacro(<<"Set the image first!");
    }


    typedef itk::ImageRegionConstIterator< InputImageType > rgbiteratorType;
    rgbiteratorType rgbit(imagergb, imagergb->GetLargestPossibleRegion());


    rgbit.GoToBegin();


    m_Output->RemoveAllPoints ();


    while(!rgbit.IsAtEnd()){


        typename InputImageType::PixelType::ComponentType lum = 0.299*rgbit.Get()[0] + 0.587*rgbit.Get()[1] + 0.114*rgbit.Get()[2];

        m_Output->AddRGBPoint(lum, rgbit.Get()[0]/255.0, rgbit.Get()[1]/255.0, rgbit.Get()[2]/255.0);

        ++rgbit;        

    }




}

}
#endif