How to create a mask from a moving clip

[Tudor “ted” jelescu]

If you can get a clean plate (the background without the dancers) then you can try to pull a difference key. You may have one in your footage or you may have to create one in PS by cloning from various frames.

https://www.youtube.com/watch?v=pzvT9cwAYkE

https://www.youtube.com/watch?v=C3ZkNIAXbbs

https://helpx.adobe.com/after-effects/using/keying-effects.html

Tudor \”Ted\” Jelescu
Senior VFX Artist

Some contents or functionalities here are not available due to your cookie preferences!

This happens because the functionality/content marked as “Google Youtube” uses cookies that you choosed to keep disabled. In order to view this content or use this functionality, please enable cookies: click here to open your cookie preferences.

[Claude Rozsa]

That’s exactly my problem, the dancers move around so the background is randomly visible or not! And I don’t have a picture of the monument , kind of temple with columns…Unles perhaps I create the whole temple in photoshop by filling the part I don’t see???
Here’s an image from the clip. i want to remove the stairs and the column behind:

[Tudor “ted” jelescu]

You need to scroll through the clip and find several frames that have different parts of the background revealed as the dancers move. Export those frames in PS, stack them and reveal from one to another the clean parts (no dancers). Whatever can not be re-built from existing footage you will have to paint using the clone tool. All you need is a pate that tells the computer to key out similar pixels, so the part that is always covered will not matter that much.
That being said, looking at your frame I think you may have a hard one on your hands. That’s because the color luma on the dancers are pretty close to the background. Give it a shot though. If this does not work look into Roto brush tutorials.

Tudor \”Ted\” Jelescu
Senior VFX Artist

[Claude Rozsa]

Thanks Ted, I’ll try that.