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View Full Version : Primatte problem with interlaced video


ClessMac
12-08-2004, 12:33 AM
Okay, Shake newbie here. I'm trying to do a little compositing work for my current project at school, and decided to use Shake since its Primatte keyer is great stuff. I have six separate shots that I have set up and keyed, and they look pretty good, except for one problem: there seems to be some weird blending going on in interlaced areas from the original clip. I've taken some screenshots to demonstrate:

http://www.copygeneral.com/airflow/comparison.png

And here's my tree for good measure:

http://www.copygeneral.com/airflow/tree.png

Any suggestions?

Aneks
12-08-2004, 01:57 AM
I can see the problem in you screen grab. But your tree does not have a de_int or an int in it ! Is there some kind of interlace function in Primatte itself !?!!? (I can't seem to remember) that might be the problem ! also as a general workflow thing I think you would be much better of not passing the whole plate though. Primatte, rather setting it to output the alpha and then using a switch matte or keymix to layer your footage.

ClessMac
12-08-2004, 02:26 AM
I can see the problem in you screen grab. But your tree does not have a de_int or an int in it ! Is there some kind of interlace function in Primatte itself !?!!? (I can't seem to remember) that might be the problem ! also as a general workflow thing I think you would be much better of not passing the whole plate though. Primatte, rather setting it to output the alpha and then using a switch matte or keymix to layer your footage.
Ah, of course, that makes sense now. I just did that in the tree and it clears things right up. It does make the whole thing a little extra complicated. Could you try to explain your idea more? I'm not sure I follow (really new at this, just going through the book for the first time).

Aneks
12-08-2004, 02:58 AM
Hi,

Hope that worked !

When u say book do you mean manual or the apple pro book ?

There should be some stuff abput this in the manual under the keying section !

if you want to confuse yourself further here are some tuts to look at, where I use both switch matte and keymix to do layering operations :

http://www.vfxtalk.com/tutorialfiles/shake/multipass_tut.zip

http://www.vfxtalk.com/tutorialfiles/shake/keying_tut.zip

ClessMac
12-08-2004, 03:00 AM
When u say book do you mean manual or the apple pro book?

I was referring to the Apple Pro Training book, the one that comes with a DVD full of tutorials. Thanks for the links!

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