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Image masking?
Hi,
I’m looking for a technique to do some masking with an image and I’m not exactly sure how.
I’m trying to essentially use differences in between two images (or frames of video) as a mask. For instance, if there’s a still shot of a landscape, and then a car drives in front, I’m looking for a way for FCPX or Motion to tell that the car wasn’t there in the source frame, and block those pixel locations from appearing in another clip in my timeline.
If any clarification is needed on my description, I’d be happy to provide it.
Thanks for input and examples!
Cameron
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2 Replies
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I believe your talking about Rotoscoping wich requires a frame by frame removal/masking of the item you want to remove. FCP is not any good for this at all. I’ve done it by exporting all frames in a shot as a png sequence and editing each one (remember 24-30 per second!) using photoshop and vowed never to do that again. After Effects CS 5.5 dies thus with ease. I’ve never tried it using Motion. I would try a search for video tutorials on rotoscoping.
Tony Brittan
Island Shore Productions
Posted from iPad, please excuse typos! -
It sounds like you’re talking about a Difference Matte – you can do this very easily in After Effects with the Difference Matte Effect.
Motion 5 currently does not have a Difference Matte Keyer nor does the old Motion – and you can’t do it in FCPX obviously.
But you could do this in FCP7 – it’s available under the Video Filters/Key menu.
Simon Ubsdell
Director/Editor/Writer
http://www.tokyo-uk.com
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