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locking the vertices of a garbage mask
I am trying to blur out the background of my clip while keeping the moving objects in the foreground clear. I have duplicated the clip, placed the blur on the bottom layer and contoured a 4 point garbage mask around the subjects to remove the background of the top layer.
Questions:
1. Is there an easier way to do this in Premier as there is in with an invert on the Ocean Systems detective spotlight plug-in?
2. I can not seem to lock the vertices of the garbage mask. In AF you can drag the mask as a whole and then adjust the vertices as needed. Anyway to do this in Premiere?
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6 Replies
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You might do better with the 8 or 16-point mattes, though they’ll be more work.
And the matte points are keyframeable.
Or are you asking something else?
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Thank you for your reply. What I am actually asking is once the mask is contoured to the subject I would like to move the mask as a whole instead of having to move the vertices one by one. In AF you can grab the mask by one of the lines and drag the whole mask across the screen. As this does not need to be a perfect mask always tightly contoured, it would make it much easier than moving each point individually. Thanks again.
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If the motion of what’s needing blurring is smooth, you can use the interpolation between keyframes to make the movements for you. You’ll need to set all four points again, but only once per move.
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Sorry, no. I need a way to move the mask as the fixed points. Something like moving a rectangular marque around the screen. Once I set the points of the mask I do not want to have to move them individually at all. I just want to move the box to follow my subjects.
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If i understand correct what you want is called a travelling matte.
Nest your matte and do the keyframing for position in the nested sequence. -
Thank you all for your replies. I ended up duplicating the video tracks, crating a title with an ellipse around my subjects, placing a track matte on Video 2, Matte to Video 3 which is the title, then did a gaussian blur on the bottom track. I can now move the title ellipse around as my subjects move around the screen. This keeps all but the ellipse track matte clear while keeping the background blurred.
Thanks again
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