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Green Screen Artifacts Issue

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Jason Jammer
Green Screen Artifacts Issue
on May 25, 2017 at 6:32:16 pm

Hello,

I'm hoping someone can shed some light on an issue I am having with a green screen video. As you can see from the attached examples, my compressed file has a lot of artifacts showing through.

My original footage is 1920x1080 and my compressed size is 720x405.

I'm using Ultra Key to knock out the green screen and putting a still frame image for the background. I also tried Color Key and that didn't work. From some research, I'm gathering that scaling down to 720x405 is crunching something and causing the artifacts.

Thanks.





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greg janza
Re: Green Screen Artifacts Issue
on May 25, 2017 at 7:02:55 pm

this is a great tutorial on how to make very clean green screen keys.

http://library.creativecow.net/articles/rabinowitz_aharon/junk_mattes/video...

Adobe Premiere 2017.1
Windows 10 Pro
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Joe Barta IV
Re: Green Screen Artifacts Issue
on May 25, 2017 at 7:05:26 pm

First, post a picture of your original shot so we can see the original green.

Second, do your effects at the full frame size to give the computer more information to work with, then reduce the size on export.

Joe

Living the SuiteLife!
Stuff for editors http://www.cafepress.com/suitelife

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Jason Jammer
Re: Green Screen Artifacts Issue
on May 25, 2017 at 7:43:29 pm

Yes at full frame 1920x1080, I can export and there is no artifacts. I did a test exporting at full frame then importing that file then exporting again at 720x405 and no artifacts were present but I'm trying to avoid that work around.



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Dave LaRonde
Re: Green Screen Artifacts Issue
on May 26, 2017 at 1:01:15 am

Actually, considering that there isn't a very strong backlight on the subject, and the subject has fly-away hair, that's not too bad. You might get the key to work better with some spill suppression.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Vince Becquiot
Re: Green Screen Artifacts Issue
on May 29, 2017 at 3:16:03 am

I'll add to all these excellent suggestions. If you're only shooting on green screen once in a while and only own an HD camera, rent a 4K camera like an FS7 and shoot 4K. You'll have a lot more color to work with even if you edit in HD and the results will be like night and day.

Vince Becquiot

Indigo Live | Kaptis Media

San Francisco Bay Area


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