Grabbing Alpha Channel from Video null as texture


I am wondering if it is possible to grab alpha information coming through a video null and convert that into a black and white texture so I can pipe that in to 2D postfx nodes like glow mask image and colour correction effect amount

Any help will be appreciated!

Best regards

channel_boolean_example.dfx (13.4 KB)
One way to do this would be using the channel boolean post-fx node on the video null. You can move the channel data round to use the alpha information for the RGB value of each pixel. That should give you a black and white texture of the alpha image which you can use elsewhere.