setting the image alpha to 0

Quite often in Elektronnaut's videos, they add an RGB mix or a Transform TOP to add a black background. But what if you wanted to removed the background?
The answer, kinda is to use a Channel Mix TOP node.

In the parameters, set the Alpha to zero & it should set the alpha of the whole frame to zero & will often remove the background -depending on what you've been doing of course

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