Garbage Matte Greenscreening
Posted: Sat, 5th Jul 2008, 10:11pm
Post 1 of 5
Now, I'm kinda new to this, so please help me out.
Say you had a guy, and you wanted to put something behind him, but you didn't use a greenscreen. Could you possibly use a garbage matte to cut out the rest of the area, and just use the "Chroma Key" thing and clear out the black the garbage matte made? And then add a picture?
Thanks in Advance!
Posted: Sun, 6th Jul 2008, 12:03am
Post 2 of 5
You would probably use a mask and rotoscope your actor very carefully, then just put an image beneath your footage. It would definitely be a lot easier with a greenscreen though, since rotoscoping an actor is a very time consuming process.
Posted: Sun, 6th Jul 2008, 12:05am
Post 3 of 5
You can use a garbage matte , but there is no need to keyout the black as the "black" area isn't really black, it's see-through (that's what a garbage matte does, removes an area of the picture entirely). Although you are also correct that you could key out black just like any other color (if indeed that was necessary in some other situation).
The problem is that you would need to redraw/adjust the garbage matte on each frame (there are 25-30 frames for each second of video), so you'll find this is a very tedious method that can take hours for a shot that lasts just a few seconds. Greenscreening is much eaiser.
EDIT: Mandalorian is apparently a faster typist than me. BTW, if you have the budget, I think there are also programs that will find the mask lines for you with some degree of accuracy, but they are a few thousand dollars.
Posted: Sun, 6th Jul 2008, 2:37am
Post 4 of 5
One of those programs is Silhouette. You can create seperate roto masks and it can track them. They also have that feature in one of the Imagineer programs, called a planar tracker. It can help roto faster, but it won't do all the work for you. They are both expensive though, like already stated.
Posted: Thu, 17th Jul 2008, 9:38pm
Post 5 of 5
I kinda thought that was what it would do, but just making sure.