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Greenscreen: Hold out matte?

Posted: Wed, 27th May 2009, 7:21pm

Post 1 of 4


Force: 2200 | Joined: 24th Apr 2009 | Posts: 2

VisionLab User PhotoKey 4 Pro User

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In my greenscreen footage I have a black table which reflects parts of the greenscreen.

My idea is to do a "mask" over the table, so that this one will not be affected by keying.

So I tried all different mask, garbage matte, object mask, but each time the result is that the table disappear. I also inverted the mascs, but then the remaining part of the image disappear...

I'm sure there must be a trick for this kind of problem. In the software "Shake" this types of masc are called "hold-out-matte"
but I don't know what is the equivalent in fxlab.

Could somebody give me a hint?

Thanks a lot
Posted: Wed, 27th May 2009, 9:13pm

Post 2 of 4


Force: 4382 | Joined: 25th Jan 2004 | Posts: 3609

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Make a copy of your footage, and it'll go onto the top layer on your timeline. Turn off all keying filters on this layer. Create your mask on this layer, and make sure you don't move the layer around at all. This layer will lay on top of your keyed footage and achieve the desired effect.

You may have to fiddle with the spill suppression or hue/saturation tools on this layer to remove some of the green tint though.

But that's the basic idea. Hope this helps! smile
Posted: Thu, 28th May 2009, 10:04am

Post 3 of 4

Simon K Jones

Force: 27955 | Joined: 1st Jan 2002 | Posts: 11683

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You can also use a garbage matte, just change it from transparent to opaque in its settings. It should then retain the selected area.
Posted: Thu, 28th May 2009, 7:59pm

Post 4 of 4


Force: 2200 | Joined: 24th Apr 2009 | Posts: 2

VisionLab User PhotoKey 4 Pro User

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Thanks both you...

I tried the two versions and they worked both great : ))

Regards from Switzerland