How remove color from image?

[GamEditoPro]

Hello, I’m making 2D UI game. Now, I made 3D model of Hypercube, and stuck with it image…

As you see, this cube emit green / red / pink light on grey background.
Does someone know, is it possible to remove grey background, and keep light on transparent background?


(2 images just for better understanding what I want)

If this’s wrong topic, tell me please correct one!

[LovreDev (Lovreware)]

Turn off the bloom setting in the render settings

[GamEditoPro]

Guy, I don’t want remove this light, I want remove grey background.

[LovreDev (Lovreware)]

[GamEditoPro]

The problem is that even if I toggle on transparent background in blender, I can’t make screenshot with that transparent background.

[LovreDev (Lovreware)]

Render it
thirtcharacterz

[GamEditoPro]

I tried screenshot it from camera using F12. Result… 2 image can replicate what I want, but 1 - correct background for it. is there any way to make bloom affect Alpha?
Color+Alpha:

Color:

Alpha:

[GamEditoPro]

After a lot of time, I realised, what I can do. I can use nodes:

+

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