Need help to change the background and more

Hey everybody! This is my first post on this forum so excuse me if its not very good.

Now, at school, we experience a realization project and I and my group want to impress the teacher really a lot of movies. We decided that our film will be defined on a boat on the way to the sink, and before it sinks you get to know the different families/people on the boat and how all this turns out to these families when the boat begins to sink. But the problem is that we don't have a boat. But I have after effects, and a normal size sheet that is completely blue, which can be used as a blue screen!

I know how to chroma key easily, but some scenes are in need of a big blue screen we have
So I spent a few hours now looking for a tutorial on how maybe change the background without anything like a blue screen , but I can't seem to find a good tutorial that helps me with what I want help with.

E.g. one of our scenes are cars climbing on the boat and the blue screen is not big enough to cover the entire car and the Earth under our car is gravel, and I can't have that. So is there anyone here who knows a few videos on the internet that could help me, or a kind soul who could write me a text tutorial on how to do this?
/ Friendly, Axel.
(btw I'm Swedish so excuse for bad spelling/grammar)

There are many times when a green screen is not wide enough to cover all the material. You end up using a combination of green screen and Rotoscoping. In your car drive you to the boat example would position the blue screen before the blue screen was behind the windows of the car because that would be the most difficult parts of the car for Rotoscoping in hand. It would be easy enough to rotoscope the wheels and underside of the car.

Take a look at this video from Lynda.com - a really great source after effects training. It will show you how the various masks are used to clean up a green screen when it does cover the whole.

There was a lot of publicity for Singapore Airlines called Across the World who had an actress works continuously with a shot that she moved seamlessly from San Francisco to Paris to Venice and across transitions, she walked in front of a green screen that was just big enough to cover here head and shoulders because it is very difficult to rotoscoping hair and hands when they move. I took a quick glance for the behind the scenes video that was produced when they initially released the commercial but couldn't find the exact. If you look closely in this video, you will see people moving green screens around as she walks.

This technique is still used on hit movies. Note here the green screen that does not hide the bottom of everything, just the parts that would be very difficult if not impossible to Rotoscoping.

Tags: After Effects

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