[vtkusers] how to map a greyscale image to a color image?

[imho]

Hi,
I'd like to colorize a medical greyscale image.

I do this :

       vtkLookupTable table = new vtkLookupTable();
       table.SetTableRange(-1800,1800);                         ***
       table.SetValueRange( 0.0, 15);                           ***
       table.SetSaturationRange( 0.0, 1.0); // 0 a  1           ***
       table.SetHueRange(  0.0,1.0 ); // 0 a 1                  ***
       table.SetAlphaRange( 0.0, 1.0); // 0 a 1
       table.SetNumberOfColors(256);
       table.Build();

       vtkImageMapToColors alpha = new vtkImageMapToColors();
       alpha.SetInput(reader.GetOutput());
       alpha.SetLookupTable(table);
       alpha.SetOutputFormatToRGB();

but the colors are ugly :p
Wich values do I have to set for *** ?
Thanks a lot