[vtkusers] Adding two images

[Alex Med]

HI,
in  blending two images what do we do for FIXING background whole 0-1 value
range
    this->blend  =
      vtkSmartPointer<vtkImageBlend>::New();
    blend->SetOpacity( 0, 1.0 );
    blend->SetOpacity( 1, 0.6 );
    blend->AddInputConnection( firstColorMapper->GetOutputPort() );
    blend->AddInputConnection( secondColorMapper->GetOutputPort() );
    blend->Update();

in this case fixed images is port : 0 but in during change foreground and
background will be changed is there any setting for blending (0-1)
background be Fixed
Thanks
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