Chroma keying objects in moving shots

[steev'sHVX]

Have you ever seen the skateboard film YEAH RIGHT!? http://www.youtube.com/watch?v=zWjG9NEInkI they paint skateboards green and key them out in post so it looks like there riding on air. i want to know how to be able to do something like this. now if the shots were still and the camera didnt pan this would seem a whole lot easier. what i dont understand is how they key in the background behind the object when the shot is panning. do they use a programmed head to recreate the shot with out the skateboarder? is there anyway of doing this with one shot? another thing is how do they add the shadows of the skaters feet? ive been trying to figure it out. my guess is a lot of frame by frame editing but am sure hoping not

thanks for any advice!

 

[handsome pete]

You'd want to use a compositing program like After Effects, Motion, Nuke, etc.

And it would require some time consuming roto work.

Check out this link:

http://www.effectscorner.com/podcast/ecwalkingpantsbkdwn-video.pt1.m4v

It's the same principle, though that commercial used locked off shots making it a bit easier.

 

[steev'sHVX]

thanks pete u understand what im trying to accomplish. know of any good tutorials on roto scoping within a moving shot?

 

[nosys70]

use mokey, it is done for that and you do not need to paint anything in green.

 

[NoahK]

Yup- use Mokey. Not free but then again you don't want to go in and paint each frame by hand in Photoshop. Do you?

 

[handsome pete]

Mokey is the most efficient way to go. The $3300 price tag might say otherwise though.