[vtkusers] Overlay with vtkImageActor or vtkImageViewer

[Jim Reigle]

Hello.

Does anyone know if there is a way to overlay one image over another
using either the vtkImageActor or vtkImageViewer classes.  I know it can
be done with vtkActor using the vtkActor::GetProperty::SetOpacity
method, however I could not find a similar function in the Image
classes.

Any help would be appreciated.

Thank you.

Jim Reigle