Nov 10 2005, 03:51 PM
Hey, gang. I'm new to version 12, so be gentle with me.
I'm trying to composite some footage shot against a green screen. It seems to me that I should be able to build a rectangular model, Stamp a decal of my footage on it (an animated decal I guess) and call it a "cookie-cut" map and somehow get the program to eliminate the green portion of the footage.
Somehow, though, this seems really inefficient. But try as I might, I can't find anything elementary on Alpha Channels and Layers. Can somebody walk a total neophyte through it?
Nov 10 2005, 05:34 PM
Alpha channels are automatic, what you need to chroma key out a particular color (and it must be exact as A:M does not key out ranges, if you need a range generate an alpha from an external app) is to set up a "key color" This in turn requires that your imported footage is 24bits (not 32 which indicates an alpha) and then you can set the property to the exact color of your footage background to key it out
refer here for more info:http://www.hash.com/htmlHelp/v12.0/GeneratedHtml/StillP.htm