[vtk-developers] Incorrect color function in vtkImageMapToWindowLevelColors with lookupTable

[xVict]

Hi David!

Some code skeleton:
// Image viewer creation
    this->imgViewer       = vtkSmartPointer<vtkImageViewer2>::New();

// Lut creation
    if (colorLut == nullptr)
        colorLut = vtkSmartPointer<vtkLookupTable>::New();
    int norm = Range[1] - Range[0] + 1;
    colorLut->SetRange(Range[0], Range[1]);
    colorLut->SetIndexedLookup(0);
    colorLut->SetNumberOfTableValues(norm);
    colorLut->Build();
    for (int i = 0; i < norm; i++) {
      double cl = double(i) / (norm - 1);
      colorLut->SetTableValue(i, cl, cl, cl);
    }

// change view option
        double c = 0.5*(this->Range[1] + this->Range[0]);
        double w = 1.0*(this->Range[1] - this->Range[0]);
        this->imgViewer->GetWindowLevel()->SetLevel(c);
        this->imgViewer->GetWindowLevel()->SetWindow(w);
        if (this->optycaltype == PSEUDO_COLOR) {
            createPseudoLUT();
            if (this->imgViewer->GetWindowLevel()->GetLookupTable() ==
nullptr)
                this->imgViewer->GetWindowLevel()->SetLookupTable(colorLut);
        }
        else {
            if (this->imgViewer->GetWindowLevel()->GetLookupTable() !=
nullptr)
                this->imgViewer->GetWindowLevel()->SetLookupTable(nullptr);
        }
        if (this->source != nullptr)
            imgViewer->Render();

For 16bit image this code should show identical picture. But for
PSEUDO_COLOR==8bit-gray (r=g=b in range [0...1] == [0...255]). 

Sincerely, Victor.




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