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Can I create a mask based off of motion...

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Austin McCarthy
Can I create a mask based off of motion...
on Oct 26, 2009 at 11:43:38 pm

Im sure thats a horrible way of wording my question, but heres what im trying to figure out.

I have a shot where the camera is on a tripod and no panning or zooming or anything is happening.

Then I have a hand enter the frame and then exits the frame.

My question is, is there a way to track/mask the change from the constant frame (empty) then when the hand enters the frame, to automatically mask around the change. So, can the change in the actual picture/pixels some how get masked based on a frame by frame basis, based on the empty frame...





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Danny Winn
Re: Can I create a mask based off of motion...
on Oct 27, 2009 at 12:05:59 am

Only if the background is a solid color like green or blue for keying. But if the background is busy with multipul colors then no. You'll have to hand draw a mask around the hand using the pen tool, click the mask stopwatch, and then change the mask points each frame.

What is it that you're trying to do exactly?


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Austin McCarthy
Re: Can I create a mask based off of motion...
on Oct 27, 2009 at 12:13:06 am

Thanks for the response!

I thought I learnt what im trying to pull off in the past, but I can't remember it and don't know how to word it correctly.

Here are links of the shot.

1. - is the empty frame
2. 3. 4. - are the hand I want to mask around

http://austinmccarthy.com/testing/SampleFootage/1.png
http://austinmccarthy.com/testing/SampleFootage/2.png
http://austinmccarthy.com/testing/SampleFootage/3.png
http://austinmccarthy.com/testing/SampleFootage/4.png


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Danny Winn
Re: Can I create a mask based off of motion...
on Oct 27, 2009 at 1:17:39 am

Hey Austin,

What effect exactly are you trying to acheive here? If I know what the end result is supposed to be I may be able to help you better.

lemme know man.


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Theo Veltman
Re: Can I create a mask based off of motion...
on Oct 27, 2009 at 5:08:51 am

If the footage is rock solid you could try a quick test with "difference matte" under keying in the effects panel and then garbage mask the shadow but from what I can see you're probably going to have to rotoscope that hand if you want it separately. If you have CS4 give Mocha a go.


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