[vtkusers] vtkImageMapToColors vtkWindowLevelLookupTable

[Shark]

David, your tip was useful to come up with a fix. 

Apparently got it working by adding SetTableValue in:

Lookup->SetMinimumTableValue(0, 0, 0, 1); 
Lookup->SetMaximumTableValue(1, 1, 1, 1); 
Lookup->SetTableValue(0, 0, 0, 0, 1);
Lookup->SetTableValue(1, 1, 1, 1, 1);
Lookup->Build(); 

Let me know if there is a more logical/correct fix. 

Thank you again,
Shark



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