vtkImageData * p = vtkImageData::New();
p->SetExtent(temp->GetFirstVTKImageData()->GetExtent ()); // Only first ! could not be 4D
p->SetScalarTypeToUnsignedChar();
vtkImageData * p = vtkImageData::New();
p->SetExtent(temp->GetFirstVTKImageData()->GetExtent ()); // Only first ! could not be 4D
p->SetScalarTypeToUnsignedChar();