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erasing a background using a mask?
Hey Folks,
Is there any way to erase the background of a layer frame by frame using a mask. I have an avi. of a pigeon walking. I want to reduce it to 15 fps and erase everything but the bird in enough frames to create a walking cycle.
If I could use the pen tool to outline the bird in each frame I’d be happy.
Future thanks, Otto -
2 Replies
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YES!! This is commonly called rotoscoping. Creative cow has a couple of pretty good tutorials on it. But basically, just create a mask the shape of the object and keyframe it every few frames. You will not need to do every frame unless the object moves very fast. (Also another hint) Mask at the satrt, and then mask at the end. Then go half way between the two and adjust the points. Keep going half way between previous keyframes and there will be a lot less movement of points to do than if you start at the begginning of the timeline and work down the line. Also, don’t put too many points if you can help it. It just makes it harder on you.
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Depending on your background immediately surrounding your object, you might be able to use s combination of rotoscoping and keying: if you create a “garbage matte” to mask out the vast majority of you bg, you can sometimes use keying to soak up what’s left around the subject. It saves mucking around with keyframes – SOMETIMES! ;o)
I’ve used this when I get bad green screen footage that won’t key well.
e.
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