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Chroma Keying headaches,

Posted: Tue, 29th Apr 2008, 8:29am

Post 1 of 16

niennumb1

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Hello-

I bought this program because I felt it looked to be a great tool to use for my effects needs. However I am having a terrible time trying to work around this video I'm working on and after seeing the tutorials I'm still getting crap results.

I know this isn't a perfectly lit green screen shot, but from the tutorials I've seen those shots don't look so hot either. I just don't know what I'm doing wrong. I do the key grade to even out the greens and after that the difference filter just makes it look bad. I've been messing with settings and sliders... I just need help here.

Here's a static frame of the shot I'm working on. Certainly there must be a method to create a good outline that WON'T show any green around my characters.



Any help in explaining proper steps to achieve a great end result would really be appreciated. I really am not liking Green Screen anymore. sad
Posted: Tue, 29th Apr 2008, 11:32am

Post 2 of 16

Darth Stazz the Powerful

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alright, i took in your pic and tried to composite it myself. the good thing is that you had a pretty good green screen to start with.

first thing i did was i went to the key grade settings and added a saturation filter. i boosted it up all the way.

next, i went to the keying settings and added a color difference filter (set to green of course). the white point was lowered to 160 and the black point was raised to 33.

after that i added a gaussian blur to the key (not using the grade filters) and gave that a value of 4.

finally, i went to the grade filters and added a spill suppression to take away any green reflected to your actors.

the shot turned out pretty well and i hope i helped you out a bit.
Posted: Tue, 29th Apr 2008, 11:47am

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NickF

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Did you mean "Nien Nunb"?
Posted: Tue, 29th Apr 2008, 9:26pm

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Plainly

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Key grading:


Chroma keying:


Spill supression grading:


The biggest problem here was that the green colour was all spilling over the guy's face:

Before:


After:

There is now some blue surrounding him, but it's a lot let obvious against the background I chose.

Then, I graded the shot to match the said background, and voilĂ !

(Well, in case you're interested, here's the grading I've done [and this, rather quickly]:



Plainly

EDIT: Now that I think about it, adding 'Light spill' as the video's composite would have been a good idea, seeing as they are against a sky. I'd show you, but I closed the project and didn't save it. unsure
Posted: Tue, 29th Apr 2008, 10:50pm

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Axeman

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Generally that amount of spill is caused by your actor being too close to the greenscreen. Try to keep the talent 5 or 6 feet from the screen at least, and lighting them separately, and you will find pulling a clean key much easier.
Posted: Wed, 30th Apr 2008, 2:34am

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Rockfilmers

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I had a go at it and the keying was kind of hard because of the edges. Color corection also goes a long way.


before


after


before


after
Posted: Wed, 30th Apr 2008, 3:23am

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Darth Stazz the Powerful

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in the picture of the 2 actors at hoth, how were you able to achieve such a unique red glow on the actor coming from the lightsaber?
Posted: Wed, 30th Apr 2008, 8:40am

Post 8 of 16

niennumb1

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Geeze, guys... You came out with WAY better results than I did. I will give these steps a try. Every one of you I thank you so much for posting your steps and I will give these a try.

Yes, I wish I shot this stuff with a bit better lighting setup. Definitely a learning experience.

Rockfilmers- how much time did that take to correct? You did an awesome job with the color enhancements!

It's hard being a one-man show doing the directing, editing and effects, especially when effects isn't entirely something I'm the best at achieving, especially with compositing.

TRUL... thank you for all your tips. Please keep this topic open. I'm learning a lot. Sometimes the video tutorials are a bit too simplified to get that "viola!" instant good composite.
Posted: Wed, 30th Apr 2008, 8:44am

Post 9 of 16

niennumb1

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Digerati Media wrote:

Did you mean "Nien Nunb"?
Yes. I just call myself that... since... like 1994 or so when I got my first email address. I know the spelling is NUNB. smile
Posted: Wed, 30th Apr 2008, 12:53pm

Post 10 of 16

Rockfilmers

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in the picture of the 2 actors at hoth, how were you able to achieve such a unique red glow on the actor coming from the lightsaber?
I just used a grade object and used the color balance filter too boost the reds and drop the blues and greens. Then use masks to limit the effect. You can also use other filters but I find that color balance works the best.
Posted: Wed, 30th Apr 2008, 11:06pm

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Rockfilmers

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One thing I forgot to say is not to forget these tools:

They help refine the edges of your matte. These tools are what make composite lab and vision lab so powerful, along with key grading. If your still getting bad results, don't worry. Keying is hard at first but with some practice, you'll know what to look for. If you have a dead line for this project, ask for help. I would be happy to help out with a few shots as I have vision lab just like you do. biggrin
Posted: Thu, 1st May 2008, 12:40am

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RodyPolis

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Yeah, Vlab and Clab are great for green screening. Just play around with the program and it should be easy. I'll post my result in a little bit.
Posted: Thu, 1st May 2008, 1:06am

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RodyPolis

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Alright this is what I got. I did it in about 5 minutes. Background was from Google. I have Composite Lab lite(an older version) so I guess you can do a lot better. Sorry, big image.
Posted: Thu, 1st May 2008, 11:17am

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NickF

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niennumb1 wrote:

Digerati Media wrote:

Did you mean "Nien Nunb"?
Yes. I just call myself that... since... like 1994 or so when I got my first email address. I know the spelling is NUNB. smile
OK, sorry about the nerdiness factor smile
Posted: Thu, 1st May 2008, 2:43pm

Post 15 of 16

niennumb1

Force: 1200 | Joined: 20th Jun 2002 | Posts: 33

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Rockfilmers wrote:

One thing I forgot to say is not to forget these tools:

They help refine the edges of your matte. These tools are what make composite lab and vision lab so powerful, along with key grading. If your still getting bad results, don't worry. Keying is hard at first but with some practice, you'll know what to look for. If you have a dead line for this project, ask for help. I would be happy to help out with a few shots as I have vision lab just like you do. biggrin
Is there a particular order you used those filters in?

Also the last poster her with the composite... VERY very well done. If i can just figure out one shot then the rest of them shouldn't be too bad. I may end up getting some help on some of this. I have a good 4+ minutes of green screen stuff needing work sad
Posted: Thu, 1st May 2008, 5:29pm

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Rockfilmers

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sorry, I don't remember the order I put them in but it doesn't matter if you experiment with it. Just combine untill you get it right.