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Green Screen Artifacts Issue
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 1920×1080 and my compressed size is 720×405.
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 720×405 is crunching something and causing the artifacts.
Thanks.
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4 Replies
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this is a great tutorial on how to make very clean green screen keys.
https://library.creativecow.net/articles/rabinowitz_aharon/junk_mattes/video-tutorial
Adobe Premiere 2017.1
Windows 10 Pro
Samsung SSD 850 EVO system
Samsung SSD 850 EVO Adobe cache
NVIDIA GeForce GTX 970
OWC Thunderbay 12t x 2 in Raid10 configuration (thru Storage Spaces and Disk Management) -
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/suitelifehttp://www.facebook.com/pages/SuiteLife/1524456414462851?ref=hl
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Yes at full frame 1920×1080, I can export and there is no artifacts. I did a test exporting at full frame then importing that file then exporting again at 720×405 and no artifacts were present but I’m trying to avoid that work around.
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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
San Francisco Bay Area
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