I thought the scenes were there was Michael Cera and his alternate personality in the same shot were done quite well.
Any idea how this is accomplished?
I have an idea as to how it would be done but it seems EXTREMELY difficult and impractical.
Actually in some cases it was probably really easy. One way I know they could do it would be to keep the camcorder stationary and then film Nick on one side. He would talk to open air acting like Francois was there. Then cut, don't move the camcorder, and have him play Francois on the other side talking to open air. In editing, they take both clips at different times, split them in half then combined the halves. Since the camcorder doesn't move you've got the illusion that they are both there at the time same time when really you have one clip from one time on the right and one clip from a later time on the left. For when there is no "cut line" to find in the middle and they are in front of each other or one is talking to the back of his head, they use doubles. If the shot is quick enough or you don't see his face much you'll never notice the difference. Not really "special effects". I've done it at home for fun.
shareI don't remember correctly, but I'm pretty sure there area couple scene where the two michaels almost "interact" with one another.
shareWell, that's what I was thinking they did, but there are a few scenes were you can see both their faces and one may walk behind the other or something like that :P
I mean I know it can be done, I was just wondering if anyone knew the methodology.
That may be done with rotoscoping. Essentially they "cut" out the background around the character for each frame. Can be very tedious. It's the same technique they use for making the light sabers in Star Wars.
sharerotoscoping isn't cutting out the background, rotoscoping is where you digitally animate over the top of a scene. Such as in A Skanner Darkly, where the actors are drawn over each frame t give it an animated look.
Everybody Wants Some!!
this effect (and the effects mentioned in the posts above) can actually be quite easily achieved now using post production compositing packages such as Adobe After Effects or Nuke
sharerotoscoping isn't cutting out the background, rotoscoping is where you digitally animate over the top of a scene. Such as in A Skanner Darkly, where the actors are drawn over each frame t give it an animated look.
Rotoscoping (often abbreviated as "roto") has often been used as a tool for visual effects in live-action movies. By tracing an object, a silhouette (called a matte) is created that can be used to extract that object from a scene for use on a different background. While blue and green screen techniques have made the process of layering subjects in scenes easier, rotoscoping still plays a large role in the production of visual effects imagery. Rotoscoping in the digital domain is often aided by motion tracking and onion-skinning software. Rotoscoping is often used in the preparation of garbage mattes for other matte-pulling processes.