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Author Topic: Difference keying?
1337mik3  1788 posts
Registered: Jun '04
24067_Palpatine
Date Posted: 4/8/05 1:06pm Subject: Difference keying?
I think this has been metioned before, but i didnt remember the exact term for it, so when i searched, i found nothing..

anyway, i was wondering what this is called, When you have an object or person with a certian background, lets say a room, then, you have another layer behind that object thast exactly the same, only without the object..

XXXXCXXXX
XXXXXXXXX

C=the object

what is it called when it atomatically keys out the X's because C is the only thing thats different?

Did that make sence?

 

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aim/videomik3
http://www.MichaelFrisk.com
It is possible to fail in many ways...while to succeed is possible only in one way.
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VaporTrail  9952 posts
Registered: May '02
14913_Obi-Wan
Date Posted: 4/8/05 1:14pm Subject: RE: Difference keying?
Is this possible?

 

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1337mik3  1788 posts
Registered: Jun '04
24067_Palpatine
Date Posted: 4/8/05 1:16pm Subject: RE: Difference keying?
Yea, i remember hearing something about it, if not here, then some other video forum, but i forgot what its called...

 

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aim/videomik3
http://www.MichaelFrisk.com
It is possible to fail in many ways...while to succeed is possible only in one way.
-Aristotle
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Funk-E  14594 posts
Registered: Sep '03
17818_Yoda and Luke
Date Posted: 4/8/05 1:16pm Subject: RE: Difference keying?
You're trying to make a difference matte.

It works, in theory, but it never works out right.

 

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Son-Of-Suns  4443 posts
Registered: Aug '00
7951_Ewan McGregor
Date Posted: 4/8/05 1:18pm Subject: RE: Difference keying?
You won't find an automatic difference keyer, you'll still have a lot of manual masking to do.

And like that...he's gone.

 

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1337mik3  1788 posts
Registered: Jun '04
24067_Palpatine
Date Posted: 4/8/05 1:19pm Subject: RE: Difference keying?
hmm, sounds familiar, i assume AE can do it?

 

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aim/videomik3
http://www.MichaelFrisk.com
It is possible to fail in many ways...while to succeed is possible only in one way.
-Aristotle
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Jedi2016  2954 posts
Registered: Jun '00
8059_Qui-Gon Jinn
Date Posted: 4/8/05 1:31pm Subject: RE: Difference keying?
Funk said it right.. AE does have this option, but it never works as well as it should. I've tried it, never had any luck with it, though.

 

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1337mik3  1788 posts
Registered: Jun '04
24067_Palpatine
Date Posted: 4/8/05 1:40pm Subject: RE: Difference keying?
Yea, i found it in there, and played around with some images in it, as far as i can tell its gonna be perfect.. But, ill see if i can do it.

 

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aim/videomik3
http://www.MichaelFrisk.com
It is possible to fail in many ways...while to succeed is possible only in one way.
-Aristotle
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DVeditor  15650 posts
Title: Fan Films Evil Overlord (manager)
 Registered: Dec '01
8081_ILM
Date Posted: 4/8/05 2:30pm Subject: RE: Difference keying?
I got it close one time. The problem is lighting, focus, subtle changes in the background, etc, etc, etc. There are so many things that can go wrong it's hard to achieve a good result. I did mind in a barn with a static background, locked focus, and a simple shot of me walking through the shot. The keyer went nuts because of all the tiny things I can't see but were picked up by the camera. I have yet to try it again, but when I do I'm going to make sure my scene is extremely well-lit, and that there is no possible way for the background to change at all. Plus applying a matte to the non-static layer will make a world or difference as well. The less there is to compare the less problems you'll have. Good luck with it - if you get something to work please post it!

 

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1337mik3  1788 posts
Registered: Jun '04
24067_Palpatine
Date Posted: 4/8/05 3:12pm Subject: RE: Difference keying?
Yea, i tried mine in my living room, it seemed perfect, all i did was stand there, but it still didnt work, so, im going to keep trying at it..

 

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aim/videomik3
http://www.MichaelFrisk.com
It is possible to fail in many ways...while to succeed is possible only in one way.
-Aristotle
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Son-Of-Suns  4443 posts
Registered: Aug '00
7951_Ewan McGregor
Date Posted: 4/8/05 5:41pm Subject: RE: Difference keying?
How was the lighting? Most home camcorders are prone to having noise on the film, making the difference matte keyer useless.

And like that...he's gone.

 

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PadawanNick  3318 posts
Registered: Jun '01
6036_Pit Droid
Date Posted: 4/8/05 7:21pm Subject: RE: Difference keying?
Here's a tutorial for doing this in Media Studio Pro.
Difference Key Compositing in Ulead Media Studio Pro.

It can be done in AE as well. I just don't know the settings off the top of my head.

Have fun.

 
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DVeditor  15650 posts
Title: Fan Films Evil Overlord (manager)
 Registered: Dec '01
8081_ILM
Date Posted: 4/8/05 8:55pm Subject: RE: Difference keying?
I sense a new AE tutorial coming on...

 

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VaporTrail  9952 posts
Registered: May '02
14913_Obi-Wan
Date Posted: 4/8/05 10:02pm Subject: RE: Difference keying?
Oh man, I hope it is as good as the MSPaint tutorial was.

This would be helpful, but I think I'll stick with just masking the background photo for now. I don't have any masking to do quite yet.. but I will very soon, so I'll be curious in the near future.
If you figure something out, don't hesitate to spread the word.

happy

 

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DVeditor  15650 posts
Title: Fan Films Evil Overlord (manager)
 Registered: Dec '01
8081_ILM
Date Posted: 4/8/05 10:07pm Subject: RE: Difference keying?
Oh man, I hope it is as good as the MSPaint tutorial was.

Are you kidding? I can't top that one...

 

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VaporTrail  9952 posts
Registered: May '02
14913_Obi-Wan
Date Posted: 4/8/05 10:09pm Subject: RE: Difference keying?
Well, get rid of all the phaser sound effects and the quick zooms, and you stand a chance.
Always a step behind me, DV.


Always a step behind.

 

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