[vtkusers] Adding a simple overlay to an image

[Sonca Teng]

Hi,

I've been assigned the task of modifying a SPECT image visualization program
written with VTK/KWWidgets, and as part of my project, I need to be able to
add image overlays. For example, I will need to draw dotted lines around
thresholded regions of interest, crosses denoting maxima, and other things
of that nature. Obviously I cannot simply be changing the actual pixel
values, or I would be damaging the underlying data.

What is the recommended approach? Any hints or suggestions at all would be
greatly appreciated.

Thanks,
Sonca Teng
MIRG
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