[vtkusers] Image Data to Polydata

[cspl]

Dear friends,
i want to display the grayscale images(medical images) and fit to image 

in given size.But the following code is giving color image as output but i want grayscale image as output.And how to convert image data to 

polydata.Please give me suggestion.
For that output i wrote the folowing code:

 vtkImageReader *Reader = vtkImageReader::New();
 Reader->SetDataByteOrderToLittleEndian();
 Reader->SetDataExtent(0,511,0,511,1,1);
 Reader->SetFileName(filepath);//give here filepath
 Reader->SetDataSpacing(1.0, 1.0, 1.0);
 Reader->SetDataMask(0x7fff);
 Reader->SetDataScalarTypeToUnsignedShort(); 
////////////////
    //vtkImageLuminance *luminance=vtkImageLuminance::New();
    //luminance->SetInput(Reader->GetOutput());

vtkImageDataGeometryFilter *geometry=vtkImageDataGeometryFilter::New();
    geometry->SetInput(Reader->GetOutput());

vtkWarpScalar *warp=vtkWarpScalar::New();
    warp->SetInput(geometry->GetOutput());
   warp->SetScaleFactor(-0.1);

vtkMergeFilter *merge=vtkMergeFilter::New();
    merge->SetGeometry(warp->GetOutput());
    merge->SetScalars(Reader->GetOutput());

vtkDataSetMapper *mapper=vtkDataSetMapper::New();
    mapper->SetInput(merge->GetOutput());
    mapper->SetScalarRange(0, 255);
    mapper->ImmediateModeRenderingOff();

vtkActor *actor=vtkActor::New();
 actor->SetMapper(mapper);

vtkRenderer *ren1=vtkRenderer::New();
vtkRenderWindow *renWin=vtkRenderWindow::New();
    renWin->AddRenderer(ren1);
 vtkRenderWindowInteractor *iren=vtkRenderWindowInteractor::New();
//    iren->SetRenderWindow(renWin);

 ren1->AddActor(actor);

 renWin->SetSize(250,250); //threse size are given dynamically
 renWin->SetParentId(m_wnd);//control Id.
 
 renWin->Render();


Thanking you,
Regards,
satyanarayana
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