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Reverse Masking
Hi,
I am making a movie using Sony Vegas V9, on Windows Vista.At the bottom video layer, I have picture/jpg. It’s a picture of outer space with some planets, start, etc. showing.
In the layer above this I have a movie clip that is some explosions. I got them for free (see below). In these free movie clips, everything except the explosion is in the color black. I want to mask this explosion layer such that the color black is the mask.
This is kind of ‘reverse’ or ‘opposite’ of regular masks, which I think use white.
YeS – I’m a newbie to Sony Vegas. I use a lot of PS on photos and stuff. So any help is appreciated and clear concise help is a wonderful blessing.
?? So how can you composite or mask a video layer, so that the color black is not seen but allows the layer beneath it to show through ???
Thanks!!!
Alex(Site for free explosion clips)
https://www.detonationfilms.com/free_stuff.htm -
3 Replies
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You can use the MASK GENERATOR to achieve this. You find the MASK GENERATOR in the VIDEO FX tab.
Theo
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Hi,
THANK YOU!! Yes, I did use the mask generator and it worked. I wish I understand better how/why… but I got my video completed.Thanks Again
Alex -
It is very easy to invert a mask, so although a “regular” mask from the days of film and Avid was white (white areas on a piece of film negative would be opaque and black transparent), black is just as common today, if not more common.
As Mr. van Laar notes, the Mask Generator set to Luminance should do the trick, but it’s a tad more complex than that:
(1) Add your explosion to a track.
(2) Right-click the track header and duplicate it. You now have two identical tracks with the same clip stacked one on top of the other. The top one will be our mask.
(3) Add a Mask Generator effect to the top clip (track or clip level) set to Luminance.
(4) Change the compositing mode of the top track to Multiply (Mask).
(5) Click the Make Compositing Child button on the lower track (to make it the Child of the Parent mask track).A bit odd at first (and second!) glance, but this is fundamental masking in Vegas, so it’s worth learning!
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“Television has made dictatorship impossible but democracy unbearable.”
– Shimon Peres
https://videopia.org
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