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Green Screen help & FCP

Posted: Wed, 10th Aug 2011, 9:25pm

Post 1 of 3


Force: 400 | Joined: 26th Mar 2009 | Posts: 6

EffectsLab Pro User

Gold Member

Hello, I'm looking for a bit of help. Please look at the photo below

The camera starts on a close up on the guys face and gradually pulls out to the shot you see.
The problem is the hand and keyboard sit outside of the green screen. I knew i was going to do some masking (around the green screen) but wanted to keep it simple (squares) and obviously a hand isn't simple.
I was going to do a simple garbage matte in FCP 7 but then realised you can only do an eight point one, which isn't sufficient.

It then occured to me that I have EffectsLab Pro. I'd not used it for years and I thought it may be the answer. So I started to try and animate a Mask (a painstaking frame by frame process), I did this and did a test export and imported it into FCP. I mistakenly thought the black would be like an alpha channel and show what was underneath...I was wrong. Can I now change the Mask into a Garbage Matte???

I have now looked at the garbage matte tutorial which i think is the right way to go about this, but am I right in thinking I cannot do this in EffectsLab Pro and nee CompositeLab?
Basically, what is my best way of doing this and bringing into FCP so I can use Green Screen.

I wish I was a bit more careful and made sure the hand was inside the green screen now!!!

Thanks for any responses i appreciate it.
Posted: Mon, 22nd Aug 2011, 9:00pm

Post 2 of 3


Force: 400 | Joined: 29th Dec 2010 | Posts: 23

CompositeLab Pro User

Gold Member

Can I now change the Mask into a Garbage Matte???
unfortunately, you can't. effectslab isn't really meant for compositing, and doesn't have the garbage matte toolset. you need visionlab or compositelab to be able to use garbage mattes.

however, if you go to the mask toolset, and click the red button that says "invert shape: off", it should invert your mask and achieve the desired effect.

if this doesn't work, maybe you could try using multiple garbage mattes instead of just one in your software. It'll be even more of a pain than doing one garbage matte, but if that's what it takes to get it to work, i'd recommend doing it.

if you can't get compositelab, or the other methods don't work, you'll either have to crop the scene so you don't see the edges of the greenscreen (or the hand), be satisfied with an eight point garbage matte (if you can, apply some feather, it'll help disguise the fact that the garbage matte had only 8 points), or just reshoot the scene.
Posted: Tue, 23rd Aug 2011, 12:32am

Post 3 of 3


Force: 2199 | Joined: 9th Aug 2005 | Posts: 855

VisionLab User VideoWrap User FXpreset Maker MacOS User FXhome Movie Maker

Gold Member

If the masks aren't working for you, you can use the neon light engine to create a black matte. Just turn off the outside glow, and set the core color to black. You should be able to make many more than 8 points, and animation is basically the same as that for a mask. You should be able to export this track with it's alpha channel, and then use it in Final Cut as a matte.