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Creating shapechanging mask from an alpha channel
Hi!
I am using RE vision Morph in AE to create a morph between several still frames. RE vision Morph uses masks to define how the morph is done. I have a couple of stills with a person cut out an placed on a transparent background and then precomposed so the alpha channel of the precomp contains the borders of the stills which I want to convert to masks. I know there is a feature called auto trace which will give me a mask for the outline. The problem is that it creates “hold keyframes” at every frame and since the stills arent moving, there is no interpolation between the masks. I tried making a new mask keyframe just every second (thats the spacing between my stills)using timeremapping but since the keyframes were “hold keyframes” it was still no interpolation. I tried to change them to “normal keyframes” but i guess the vertices where strangly distributed because there was interpolation now but the person on the stills was messed up (cut here and ther by the mask).So the question is: Is there a way to quickly make a mask from an alpha channel at time 0 and another at time 1 s and another at time 2 s and so on and combine them to one single mask whose shape is interpolated between the different samplings in time.
thanks
jodal -
3 Replies
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Have you tried “Autotrace”
Layer–> Autotrace
Should do what you need it to…
Jim Dodson
Quad 2.5 gig Mac – OSX
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Ooops — sorry Jodal. Just re-read your post. You have tried Autotrace…
Jim Dodson
Quad 2.5 gig Mac – OSX
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No, not really. Masks have no way of relating to each other, so they never know where which vertex is or even how many of them form a contiguous shape. I’m afraid you’ll have to take the bitter pill and match them manually. If you findsome nice guy like Dan, they may be able to create a script for you that takes away some of the pain, but even then you’ll still have to do some manual cleanup.
Mylenium
[Pour Myl
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