Get alpha from Post process material??

Development Rendering
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Hi everyone,
Right now I’m working on draw buffer from post process material to render target. So,I would like to get alpha channel from post process material. Then I found this setting like this image.

217525-1.png

I set it true but the alpha didn’t come. How can I get alpha with rgb color and draw to render target. Thank you!!

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I’d really like to know what this setting does, too. It adds “Opacity” output to the material. But I could not see any change while testing. Right now (UE 4.18) it seems not to be completely implemented:

Outputting alpha is not yet supported (should go through Opacity).

Maybe this helps you: You can lerp your PP effect with SceneTexture:PostProcessInput0 to make it look like it has transparency…