[vtkusers] Correctly vtkImageBlend use?

[Ana Sandro]

Hello everybody,

   I want to visualize two images together like if they were only one.So I 
read them with itk,I connect them to vtk and later I put them at the entries 
of vtkImageBlend.( I adjunt this code below).This way I get an error because 
I put vtkImageData into vtkImageBlend and it needs vtkImageStencilData.This 
is the error I get:

ERROR: In D:\ana\Programas\VTK-5.0.0\Filtering\vtkDemandDrivenPipeline.cxx, 
line 774
vtkStreamingDemandDrivenPipeline (0x02A79170): Input for connection index 0 
on input port index 1 for algorithm vtkImageBlend(0x02A76480) is of type 
vtkImageData, but a vtkImageStencilData is required.

I don't know how to get vtkImageData to be vtkImageStencilData.Maybe I have 
to use another class instead of vtkImageBlend or use some filter before 
using it.If someone could orientate me I'd thank it very much because I have 
no idea of how to get it.

This is my code:

typedef itk::Image<signed short,2> ImageType1;
typedef itk::ImageFileReader<ImageType1> ReaderType1;
typedef itk::ImageToVTKImageFilter<ImageType1> ConnectorType1;
ReaderType1::Pointer reader1= ReaderType1::New();
ConnectorType1::Pointer connector1= ConnectorType1::New();
reader1->SetFileName("imagen1.dcm");
connector1->SetInput( reader1->GetOutput() );

//the same for the other image
typedef itk::Image<unsigned short,2> ImageType;
typedef itk::ImageFileReader<ImageType> ReaderType;
typedef itk::ImageToVTKImageFilter<ImageType> ConnectorType;
ReaderType::Pointer reader= ReaderType::New();
ConnectorType::Pointer connector= ConnectorType::New();
reader->SetFileName("imagen.dcm");
connector->SetInput( reader->GetOutput() );

vtkImageBlend* blend = vtkImageBlend::New();
blend->SetOpacity(0, 0.5);
blend->SetOpacity(1, 0.5);
blend->SetInput(0,connector1->GetOutput());  //that's the fail.
blend->SetInput(1,connector->GetOutput());

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