[vtkusers] Thresholding with Transparency

[Sylvain Jaume]

Hi Ben,

You cannot get a 'transparent image'. But  you can make part of your 
image transparent if you render it on top of another one. Are you 
rendering your image with a vtkActor?
vtkImageThreshold will turn your image into an image with Foreground / 
Background.

Cheers,
Sylvain

Ben Wilde wrote:

> Hello,
>
> I am very, very new to VTK, and I'm trying to do some video processing 
> that I don't imagine should be too complicated.
>
> I have some video data that I would like to apply a threshold to, in 
> which only the image above the threshold appears, and the 
> non-thresholded sections are transparent.
>
> I am using am using video.getOutput to turn my video into an image.  I 
> have looked at using vtkImageThreshold, but I can't figure out how to 
> make the thresholded parts of the image transparent.  Am I missing 
> something easy?  If not, does anybody have suggestions on how to proceed?
>
> I apologize if this is too easy or if I misused any terminology.  
> Again, I'm am about as much of a beginner as you can be.
>
> Thank you,
> Ben
>
>
> _______________________________________________
> This is the private VTK discussion list. Please keep messages 
> on-topic. Check the FAQ at: http://www.vtk.org/Wiki/VTK_FAQ
> Follow this link to subscribe/unsubscribe:
> http://www.vtk.org/mailman/listinfo/vtkusers
>