[vtkusers] Set ImageData to zero

[speedy]

Sorry if this question actually has a simple answer, but what is the fastest
way to set every pixel of a vtkImageData to zero (or any other value fitting
in its pixeltype)? 
I've tried vtkImageThreshold, but it doesn't seem to do anything or maybe I
am using it wrong:

  threshold = vtkSmartPointer<vtkImageThreshold>::New();
  threshold->SetInput(Image);
  threshold->ReplaceOutOn();
  threshold->SetOutValue(Value);
  threshold->ThresholdByLower(maximum_image_value); 
  threshold->Update();

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