2D image display

[John Biddiscombe]

I've never used ImageViewer but you might have all black display because 
>    viewer->SetColorWindow(2000);
>    viewer->SetColorLevel(1000);
and 
>    F->SetDrawColor(0.0);
>    F->FillBox(0,255,0,255);
>    F->SetDrawColor(2.0);

try 
   viewer->SetColorWindow(20);
   viewer->SetColorLevel(10);

enhance the contrast ???

JB


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