How do I make an effect on green screen?

[AI Discover Hub]

Here is an example https://www.youtube.com/watch?v=HCdN15jQ9CQ

I can make the snow.

But I can't figure out how to put it on green screen so that I can remove that color later in my final video production.

I was able to make it so that it had a black background, and remove that color, but it made the edges of the snow flakes grayish black.

I'd also like to make other effects on green screen, like fire in a fireplace, or candle flame, or steaming cup of tea.

[Rick Gerard]

Make the snow, delete the green layer, check the transparency grid to make sure there are no pixels behind the snow, and then choose 
Composition/Pre-render to render a High Quality With Alpha movie of your comp. You could also just add the comp to the Render Queue and pick the High Quality with Alpha output module preset from the dropdown menu. 

If you create a comp with a black background, you can just set the blend mode of the rendered movie to Screen, Add, or even Overlay to remove the black pixels.

[AI Discover Hub]

Thank you, Rick. There are several things you mentioned that I will need to look up how to do. 

One of the issues I ran into was needing a dark background just to see the snow I was creating, and then rendering with a green background.

I'll try your suggestions.

[AI Discover Hub]

Hi Rick, I was trying to follow your instructions. But I'm using CC Snowflake for making the snow, so it needs a layer to add that affect to it first. I can't get rid of that layer. Is there any step-by-step tutorial on this anywhere? I can't find one.

[Airweb_AE]

You can go to Layer menu > Solid Settings... and change the solid color to green.

Or

You need to uncheck: Composite With Original

And then add a green solid layer for the background

[AI Discover Hub]

Thank you Airweb_AE!!! I believe that was a big chunk of the problem. But, I have found another way to do it by duplicating the snow layer and then hiding it. Then putting a solid layer background of medium gray behind both. Then using Luma Key on the gray. For the snowit works. But that likely won't work for other things.

I'll try it the way you suggested next.

[Airweb_AE]

But you can also render the animation with a transparent background using MOV format.

Output Module: High Quality with Alpha

Then click on High Quality with Alpha and make sure format is set to Quicktime and channels is set to RGB + Alpha

[AI Discover Hub]

Tried that. But the editor I'll be using it in does not support that format. And if I want to make this widely available, it will have to be a render codec that is widely supported.