Mask chroma Keyer effect?

Hey!

Working on a video where we have a shot of a room, where there's a partial green screen. The idea is that it should look like a window. However... things were not done quite properly and it's causing problems. as the green isn't good enough, so no matter what I do, the rest of the image is affected...Most effects have a mask you can activate, but the Keyer doesn't... what would be the best way to limit the keyer effect to the square? (see image)



(image has LUT with film grain on it, have been applying keyer is before LUT so image isn't quite as noisy as appears here, but far from ideal)

DmitriZigany wrote: … no matter what I do, the rest of the image is affected...…

ok, based upon you highly compressed screen-grab, I can not confirm any 'affections':



… did a sample = key's just fine.
No?

As Karsten shows, it should work, but only when you manually sample an area.

Personally, I'd jump all over who ever was in charge of shooting this. Stretch that screen tight, put a light on it, jeez!

But yeah, I had the same result as Karsten. It helps to learn all the tools available in the Keyer, as most green/blue screens, in my humble experience, are rarely lit nor hung correctly.

… and in addendum to my first reply:
Using The Worst Green Screens In Movie Making History in my school projects, I sing praises about FCPX 'auto settings' …

Keep in mind, you can set/culminate several Samples - in different places and in diff. times…

FCPX handles even such disasters successfully …:



:woohoo:

FCPX.guru wrote: Personally, I'd jump all over who ever was in charge of shooting this. Stretch that screen tight, put a light on it, jeez!

Well, I shot it

And we new it was a gamble, but time and money and space etc didn't allow for anything else... Now trying to make the best of a shitty situation...

Thing is, it it removes green from the rest of the image, giving everything a magenta cast... and if I improve the key to make it look good around the hair, other parts of the image gets keyed out as well... if I could only limit the keyer plug-in to an area around the square like with almost all other effects it would be fine...

Karsten Schlüter wrote: …
Keep in mind, you can set/culminate several Samples - in different places and in diff. times…

FCPX handles even such disasters successfully …:



:woohoo:

Yes, if it was ONLY greenscreen around the subject it would have been no problem... problem is that its just a screen that needs to go....

You need to duplicate the clip on top of itself. Mask out the green screen on the top copy. The bottom copy will have only the green screen and perhaps some stuff just around it. Key that. Then your sky or whatever underneath all of that stuff.

It's called a Garbage Matte, because it mattes out all the garbage that is not your green screen you need to key.

But as Karsten showed, you should be able to manually sample out what you need keyed.

As Ben has explained, you can use a garbage matte to limit the keyer effect.

That will help as long as the content within the mask in front of the green screen has not been affected too much. If the content in front of the green screen is affected too much, limiting the keyer will be useless.

But I agree you should be able to get a fairly decent key out of this without a mask. It is even possible to do this based on the low quality still you have posted:



- Ronny

And this just for educational purposes;
help.apple.com/finalcutpro/mac/10.4/#/ver40b0069e

conc. hair and spill and stuff:
my heroes at rippletraining.com offer advice in under 5min, for keying sub-par material