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green screen "noise" added to my footage after export

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marco Giordanigreen screen "noise" added to my footage after export
by on Jan 2, 2014 at 12:08:41 pm

I am using after effects for the first time and keying out a green screen. I am having trouble exporting the footage out of after effects and having it look as good as how it went in. There is grain over all of the brightest parts of the image as well as the black. Not sure why this is doing that. I'd like to key out the green and have it look the same.

Thanks,
Jenny



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John CuevasRe: green screen "noise" added to my footage after export
by on Jan 2, 2014 at 2:24:11 pm

I have that happen when I use Keylight. If you are using keylight, instead of using the final result, try using the intermediate, seems to work better when I do that.

Another thing you can do is just take your "original" footage and drop it below the keyed footage-then just change the track matte of the original unkeyed footage to alpha matte.

Johnny Cuevas, Editor
Thinkck.com

"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.


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marco GiordaniRe: green screen "noise" added to my footage after export
by on Jan 3, 2014 at 2:40:51 pm

Thanks for the reply! I am using key light.

"If you are using keylight, instead of using the final result, try using the intermediate, seems to work better when I do that."

------------------

Another thing you can do is just take your "original" footage and drop it below the keyed footage-then just change the track matte of the original unkeyed footage to alpha matte.

now this is a great idea, but I am using apple pro res and I don't think there is a render option with the alpha channel???? If there is I will definitely try this.

Thanks,
Jenny



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John CuevasRe: green screen "noise" added to my footage after export
by on Jan 3, 2014 at 3:46:13 pm
Last Edited By John Cuevas on Jan 3, 2014 at 3:46:48 pm

You don't need to render out an alpha channel. Composite everything in AE. Use keylight and create a key on your green screen footage. Now just duplicate that layer and on the bottom of the 2 layers, delete the keylight effect, and now change the track matte of that layer to "alpha". Finally drop your background to the bottom of the layer stack and render. Hope I explained that better this time.

Johnny Cuevas, Editor
Thinkck.com

"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.


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marco GiordaniRe: green screen "noise" added to my footage after export
by on Jan 3, 2014 at 3:57:52 pm

Yes, I just did this and thanks for the explanation. Here is the current problem that I discovered. This is not a keylight issue, it looks like this is an after effects issue. I shut off keylight and the "noise" is still there over the blacks. I think it might be a setting in after effects????



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