[vtkusers] How to get the color of contours

[Jothy]

Hi all,

I am trying to create a set of contour lines using vtkContourFilter,
for instance[50,60,70]. Since there is no way to create legends in vtk
for these lines, I am trying to create a text for each line with the
corresponding color. But how to get the color of these lines?

Thanks,

Jothy