[vtkusers] vtkImageMapToColors doesn't work on vtkImageViewer2

[Liu_tj]

Hi, VTK guys,

I use vtkImageViewer2 to display DICOM series. Now I want to display special color for some grayscale threshold. But it doesn't work. Any steps do I miss? Below is my C# code. Segament_Threshold is a defined class including two members: Min_Threshold and Max_Threshold.

      private void GrayToColors( Segament_Threshold threshold)
        {
            m_scalarrange = new double[2];
            m_scalarrange = m_imageViewer.GetInput().GetScalarRange();
            vtkLookupTable lookupTable = vtkLookupTable.New();

            double validmin = System.Math.Max(m_scalarrange[0], threshold.Min_Threshold);
            double validmax = System.Math.Min(m_scalarrange[1], threshold.Max_Threshold);
            int number = (int)(m_scalarrange[1] - m_scalarrange[0] + 1);
            lookupTable.SetRange(m_scalarrange[0], m_scalarrange[1]);
            lookupTable.SetNumberOfTableValues(number);
            lookupTable.Build();

            for (int i = (int)(m_scalarrange[0]); i < (int)(validmin); i++)
            {
                lookupTable.SetTableValue(i - (int)m_scalarrange[0], 0.0, 0.0, 0.0, 0.0);
            }
            for (int i = (int)(validmin); i <= (int)(validmax); i++)
            {
                lookupTable.SetTableValue(i - (int)m_scalarrange[0], 0x66 / 0xff, 1.0, 1.0, 1.0);
            }
            for (int i = (int)(threshold.Max_Threshold) + 1; i < (int)(m_scalarrange[1]); i++)
            {
                lookupTable.SetTableValue(i - (int)m_scalarrange[0], 0.0, 0.0, 0.0, 0.0);
            }

            vtkImageMapToColors colormapper = vtkImageMapToColors.New();
            colormapper.SetInputData(m_imageViewer.GetInput());
            colormapper.SetOutputFormatToRGB();
            colormapper.PassAlphaToOutputOn();
            colormapper.SetLookupTable(lookupTable);
            colormapper.Update();

            if (m_colormapActor == null)
            {
                m_colormapActor = vtkImageActor.New();
                m_colormapActor.GetMapper().SetInputConnection(colormapper.GetOutputPort());
                m_renderer.AddActor(m_colormapActor);
            }
            m_renderer.ResetCamera();
            m_renderer.Modified();
            m_imageViewer.SetRenderer(m_renderer);
            m_imageViewer.Render();
        }

Thanks
Liu Peng
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