A moving green screen shot
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- TheMonkeyMan
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A moving green screen shot
Hello, Im new to this forum. Although I have been looking around this site and other video sites for a while. What a great forum!
Anyways.... I was watching a skateboard video not to long ago called "Yeah Right!". In that film there is a scene where they green screen the boards out of the picture, so it looks as if they are riding invisble boards. Now some of the shots the camera was steady and just pointing in one direction, which is easy to figure out how they did those, but they also had shots where the camera is moving and filming the skater while the boards were invisible. I was wondering how they green screened the boards out of those moving camera shots since it would be very difficult to do the EXACT same camera movements for the empty picture then move the camera the exact same way for the part with the skater. Or is that how they did it? Any help would be great! Thanks
Anyways.... I was watching a skateboard video not to long ago called "Yeah Right!". In that film there is a scene where they green screen the boards out of the picture, so it looks as if they are riding invisble boards. Now some of the shots the camera was steady and just pointing in one direction, which is easy to figure out how they did those, but they also had shots where the camera is moving and filming the skater while the boards were invisible. I was wondering how they green screened the boards out of those moving camera shots since it would be very difficult to do the EXACT same camera movements for the empty picture then move the camera the exact same way for the part with the skater. Or is that how they did it? Any help would be great! Thanks
actually it would be very difficult to mask out a moving shot because it would be almost impossible to get a clean background plate that exactly matches the moving footage. more likely (depending on the budget of the film) is that they used a computer controlled camera (often they look like a dolly on a track housed in a big box). it can record its movements and repeat them an infinite number of times.
Syras wrote:actually it would be very difficult to mask out a moving shot because it would be almost impossible to get a clean background plate that exactly matches the moving footage. more likely (depending on the budget of the film) is that they used a computer controlled camera (often they look like a dolly on a track housed in a big box). it can record its movements and repeat them an infinite number of times.
If you have the track, then you line the track across the street, and then film the background shot. Then you film the person in the exact speed motion and angel of the other one. And most people can't afford a track like that, althougth Ryan W. was creative, he used his lego train track ( Thats still like what, 150$? ) which controls speed, and found a way to attach his camera.
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- V|Esquilaxer
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I saw that skateboard video and I was amazed at how well they did the job. It looked great, especially when it mind-boggles me how they could do such a thing with such accuracy
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- TheMonkeyMan
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Yeah they did a VERY good job at editing that film, with the invisble board and the beginning of the film with the extrememly slowed down skatetricks was awesome. Here is the link to the trailer: http://www.rhinotransport.com/970247.lasso# It shows a scene of the invisible board on it.
- TheMonkeyMan
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green screening requires a specific colour that can be "keyed" out. this is basically the process of telling the effects program that anything that is bright green is now invisible. masking however requires drawing a shape (the mask) on a layer and making that part invisible. you can use keyframes to make the mask move and thus cover specific areas (eg you could draw a skateboard shape and animate it frame by frame to make sure the skateboard is invisible for the entire shot). in both cases you require a background layer to replace the footage (in the skateboard case footage of the street behind). however to make this look perfect the front layer and the background layer must match up exactly
Masking is another form of keying. In theory, it's EXACTLY the same thing. One of them your telling the program , get everything of this specific color outta here, and in another the backgrounds whatever the hell you want, and you control what stays and what goes. Since you need no balance of color, you can light the actor however you choose when masking. With masking, it's a lot easier to background footage and mask the person in , BECUASE you just film the scene twice, one with the actor(s), one without. Mask the actors, which removes EVERYTHING but them, and place them onto the footage without the actors. There you go , you got the actor keyed now, and you can do whatever you want to each one(mask) without effecting anything else. Thats the whole idea with invisble skateboard, is the masked the skateboard and just well, got rid of it!
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- TheMonkeyMan
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- BrownCowStudios
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Um, i'm not talking photoshop or flash. I'm talking affter effects.TheMonkeyMan wrote:I understand what a mask is. I have worked with photoshop and flash animation for a while, so I know all about that stuff. But it seems to me that making a perfect mask around the board and not accidently getting his feet cut out would be very hard. Especially when hes moving.
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- TheMonkeyMan
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Yeah no kidding blade. You're a quick one . All I was stating was that I know what MASKS are, because I have worked with a lot of photo editing programs... Anyways, Thats why I suggested making just a small general masked area around the board, then keying the board out, so I wouldn't have to go frame by frame making sure the mask was perfect.
- TheMonkeyMan
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Oh man, its Blade! The almighty video master! Bow down to him! I am by no means a good video editor I admit that, and im not saying im better than you or anyone else here blade, but when you act like you are the almighty wise one, when practically half of your posts are spamming garbage then that makes me quite angry. I wasn't trying to act like I knew everything about editing at all when I said I knew about masks.
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lol This is a funny thread.
You can set masks to follow differences in footage, like a moving line, in After Effects. Though sometimes you just have to resort to frame by frame tracking. The dirty work of filmmaking!
You can set masks to follow differences in footage, like a moving line, in After Effects. Though sometimes you just have to resort to frame by frame tracking. The dirty work of filmmaking!
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AAA-O :: Anything, Anywhere, Anytime, Bar Nothing!
umm... all I said was you have a lot to learn where do you get me saying im better then everyone? Oh and thanks for bowing down, you should do that more often. :Roll: Some people..TheMonkeyMan wrote:Oh man, its Blade! The almighty video master! Bow down to him! I am by no means a good video editor I admit that, and im not saying im better than you or anyone else here blade, but when you act like you are the almighty wise one, when practically half of your posts are spamming garbage then that makes me quite angry. I wasn't trying to act like I knew everything about editing at all when I said I knew about masks.
Sigs suck a**.