Why rendering of Paint Filter labelmap is different from rendering of background image with ImageSlice?

Hello,

I have adapted PaintWidget example for creating labelmap to original image.
When I have interpolation set on off, I can see that the label map created
with paint widget is rendered in a different way than original image. It
looks like origins are different. 
Why is that? Is it possible to have overlay "aligned" to background image?

<http://vtk.1045678.n5.nabble.com/file/t342677/PaintFilter.png> 



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