[Insight-users] Overlay segmented binary image on vtkImageViewer2

[David Doria]

On Thu, Feb 17, 2011 at 7:40 AM, Xiaopeng Yang <yxp233 at postech.ac.kr> wrote:
>
> Wow, that’s a great project! But it is hard for me to understand it. I
applied vtkImageBlend to combine the original and mask images. That’s a
pretty easy way for me. But I cannot change the mask image color. Do you
have any idea to change the mask image color?
>
>
>
>
>
>   vtkSmartPointer<vtkLookupTable> table1 =
vtkSmartPointer<vtkLookupTable>::New();
>
>   table1->SetRange(100, 150);
>
>   table1->SetValueRange(0.0, 1.0);
>
>   table1->SetSaturationRange(0.0, 0.0);
>
>   table1->SetRampToLinear();
>
>   table1->Build();
>
>
>
>   vtkSmartPointer<vtkImageMapToColors> color1 =
vtkSmartPointer<vtkImageMapToColors>::New();
>
>   color1->SetLookupTable(table1);
>
>   color1->SetInput(Original->GetOutput());//original image
>
> color1->Update();
>
>
>
>   vtkSmartPointer<vtkLookupTable> table2 =
vtkSmartPointer<vtkLookupTable>::New();
>
>   table2->SetRange(0, 255);
>
>   table2->SetValueRange(0,1);
>
>   table2->SetSaturationRange(0.0, 0.0);
>
>   table2->SetRampToLinear();
>
>   table2->Build();
>
>
>
>   vtkSmartPointer<vtkImageMapToColors> color2 =
vtkSmartPointer<vtkImageMapToColors>::New();
>
>   color2->SetLookupTable(table2);
>
>   color2->SetInput(Mask->GetOutput());//mask image
>
>   color2->Update();
>
>
>
>   vtkSmartPointer<vtkImageBlend> imgBlender =
>
>       vtkSmartPointer<vtkImageBlend>::New();
>
>   imgBlender->SetOpacity( 0, 1 );
>
>   imgBlender->SetOpacity( 1, 0.3 );
>
>
>
>   imgBlender->SetInput( 0, color1->GetOutput() );
>
>   imgBlender->SetInput( 1, color2->GetOutput() );
>
>
>
> vtkImageViewer2 *imageViewer1 = vtkImageViewer2::New();

Look at the SetTableValue calls in this example:
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Images/Transparency

Also, by using ImageBlend you remove the option (which I always allow) to
toggle the mask visibility (well, I suppose you could toggle between the
original image and the blended image, but why not just turn on/off the
mask?)

David
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