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superjab
02-18-2005, 12:34 AM
Hi everyone.
When people are filmed in real actions and we want to use a different location, a green/blue screen is located behind them, after filming the sequence you can substitute the background with some digital landscape or matte painting.

Do you know how to do this? i guess it is possible during the post production with after effects but i would like to have further information.
thanks

superjab

-Vormav-
02-18-2005, 01:19 AM
Yeah. It's called chroma keying, and can be done in pretty much every compositing program, as well as some NLEs (although with fewer controls).
In After Effects, you can get to all of the keyers by right clicking on your footage and navigating to effect->keying. From there, "color key" is probably the one you'd normally use. But of course, all of the other keyers have their uses, depending on the situation.

Khalor
02-18-2005, 03:18 AM
Try to use markers on the green screen, which can be later used to track your background footage/matte painting onto.

superjab
02-18-2005, 10:38 PM
Thanks guys i appreciated the help.
Anyway i'm not quite sure if i understood it. Do you know any tutorials about matches real footage and digital landscape? Something step by step in After effects.
What i want to do is easy, i would like to know how i can achieve the effect. For instance, i film someone on a blu/green screen after that i do a CG animation and then i blend the video with the animation together in after effects.(put on the screen the CG animation and keep the real actor in foreground). That's all.
Thanks

ald1225
02-19-2005, 12:21 AM
http://www.creativecow.net/show.php?forumid=2&page=/articles/chromakeying.html
http://www.pcquest.com/content/multimedia/2004/104070101.asp
http://www.theforce.net/fanfilms/software/aftereffects/hobson_tutorial/index.asp

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