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Can I define an area that will not be keyed out?

Posted: Thu, 27th Jan 2005, 5:08am

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Hendo

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Hi,

Is it possible to define an area, like a mask, that will not be affected by Keying tools?

For example, if I have an actor against a green-screen but the actor has sunglasses with green lenses, I want to keep the whole actor, including the green lenses. In other words, the actor's outline is fully distinct from the green-screen, but within the actor's profile, there is some green.

Please accept my apologies if this has been answered elsewhere -- I did read the manual and search the forums!

Thanks,
Neil
Posted: Thu, 27th Jan 2005, 8:44am

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Hendo

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I came up with one solution, though not ideal:

Place a copy of the actor footage on two layers, one on top of the other. Go to the bottom layer and create a garbage matte over everything except for the green that you want to keep. (In my earlier example, the result would only show the green sunglass lenses.)

Then go to the top layer and key the green out.

This action would key out all the green (including lenses) from the top layer, but the resulting composite would reveal the green lenses from the bottom layer, hence the desired result.
Posted: Thu, 27th Jan 2005, 9:07am

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Hybrid-Halo

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SuperUser

Hendo is absolutely right, but to turn his advice into a quick step by step guide:

1) place 2 layers of the same clip onto the timeline so your timeline looks like this:
1.clip1
2.clip2

2) on the clip that is uppermost(I believe Clip1) put a garbage matte around the glasses, I believe this will need to be animated and make sure you tick inverse. So all that is kept of the clip is the glasses/green area on the character you want to keep.

3) on the background clip, perform a standard green key out.

You'll get what you wanted, just remember to go back and animate the garbage matte over the glasses.

Alternatively. You could put a different colour into the characters glasses and key that out seperately. Though the first method is probably the better of the two.
Posted: Thu, 27th Jan 2005, 10:31am

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Simon K Jones

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Here's a quicker way, that only requires one copy of the clip:

1. Draw a garbage matte around the area you want to retain. Change its settings to Opaque Matte.

2. Key the green out.

That's it. smile

If you change a gmatte to 'opaque', the selected area adds itself to the matte, instead of removing it as usual.
Posted: Thu, 27th Jan 2005, 11:21am

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Hendo

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Thanks for that. I had just finished the render using my idea above, but in future I'll know what to do!

Thanks,
Neil