[Insight-users] Help writing RGB 3D file

[nicest guy]

Hello, 
I'm trying to develop 3D program. 
I read CT data. and use ITK to save it as ".vtk" file. 
and I use VTk to display it as 3D. 

it works fine, VTK shows gray color 3D(of cource, original source(CT) is
gray image) 

But if i try to make RGB 3D image. VTK never drawed colorfully. it just
drawed gray garbage data. 

So i'm wondering whether following ITK source code is wrong or not to write
RGB 3D data. 

==============[main source]================== 
typedef itk::RGBPixel<unsigned char>   RGBPixelType; 
typedef itk::Image<unsigned short, 3> ImageNDType; 
typedef itk::Image<RGBPixelType, 3> ImageColorNDType; 
typedef itk::ImageSeriesReader<ImageNDType> ReaderType; 
typedef itk::RGBConvertingFilter< ImageNDType, ImageColorNDType >
RGBConvertingType; 

itk::DICOMImageIO2::Pointer io = itk::DICOMImageIO2::New(); 

// Get the DICOM filenames from the directory 
itk::DICOMSeriesFileNames::Pointer names = itk::DICOMSeriesFileNames::New(); 
names->SetDirectory("C:\\CT\\test6"); 
  
ReaderType::Pointer reader = ReaderType::New(); 
reader->SetFileNames(names->GetFileNames()); 
reader->SetImageIO(io); 

reader->Update(); 
reader->GetOutput()->Print(std::cout); 

RGBConvertingType::Pointer converting = RGBConvertingType::New(); 
converting->SetInput(reader->GetOutput()); 

typedef itk::ImageFileWriter<ImageColorNDType> WriterType; 

WriterType::Pointer writer = WriterType::New(); 
writer->SetFileName("c:\\Image.vtk"); 
writer->SetInput( converting->GetOutput() ); 
  
==============[RGB converting filter source]================== 
inputIt.GoToBegin(); 
outputIt.GoToBegin(); 

while( !inputIt.IsAtEnd() ) 
{ 
    while( !inputIt.IsAtEndOfLine() ) 
      { 
        RGBPixelType p; 

             unsigned char r = inputIt.Get(); 
        p.SetRed(r); 
        p.SetGreen(0); 
        p.SetBlue(0); 

        outputIt.Set(p); //make it red image 

            ++inputIt; 
            ++outputIt; 
            progress.CompletedPixel(); 
      } 

    inputIt.NextLine(); 
    outputIt.GoToEndOfLine(); // NextLine() assumes that the 
    outputIt.NextLine();      // iterator is at the end of line. 
}
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