Project-iM@S

Community => General chatter => Topic started by: Gordon1564 on December 01, 2012, 05:51:43 pm

Title: How to remove the background of the idolm@ster videos?
Post by: Gordon1564 on December 01, 2012, 05:51:43 pm
I just saw this video yesterday:
 http://www.youtube.com/watch?v=mgl-d-UsAD8

So I wonder how could they key out the background and add another background with some great efftects, anyone knows how to do that? I really want to make a video like that.
Title: Re: How to remove the background of the idolm@ster videos?
Post by: Accoun on December 01, 2012, 06:12:03 pm
I assume it's done by hand, using masks in f.ex. After Effects or Photoshop...
Title: Re: How to remove the background of the idolm@ster videos?
Post by: Cael K. on December 01, 2012, 07:35:58 pm
We had this discussion quite a while ago, actually.

http://forum.project-imas.com/index.php/topic,1487.0.html

I don't know if anything new's popped up since then, but it should give you an idea of how it's done. In this case, I think I remember it looking like some sort of edge detection algorithm at the heart of it all.
Title: Re: How to remove the background of the idolm@ster videos?
Post by: animagic4u on December 01, 2012, 07:52:29 pm
Quote from: Gordon1564 on December 01, 2012, 05:51:43 pm
I just saw this video yesterday:
 http://www.youtube.com/watch?v=mgl-d-UsAD8

So I wonder how could they key out the background and add another background with some great efftects, anyone knows how to do that? I really want to make a video like that.

Umm actually in some of the videos it's built into L4U or you can use a blue background in SP.
Then use a bluescreen app in the editor of your choice.
Title: Re: How to remove the background of the idolm@ster videos?
Post by: Gordon1564 on December 03, 2012, 03:51:45 pm
Uhm... After watch that video you provide me, I figure out how to do that. They use an effect called different matte, you will need 3 videos with your characters have the same costume so the only different between 3 videos is the background so the effect will remove the background and keep your idols. But it's seems difficult for me because I don't own any PS3 or Xbox360 to have enough videos and do that effect. Really hope someone wants to cooperation with me... Anyways, thanks you guys a lot.
Title: Re: How to remove the background of the idolm@ster videos?
Post by: Setsuna on December 03, 2012, 08:09:46 pm
Quote from: Gordon1564 on December 03, 2012, 03:51:45 pm
Uhm... After watch that video you provide me, I figure out how to do that. They use an effect called different matte, you will need 3 videos with your characters have the same costume so the only different between 3 videos is the background so the effect will remove the background and keep your idols. But it's seems difficult for me because I don't own any PS3 or Xbox360 to have enough videos and do that effect. Really hope someone wants to cooperation with me... Anyways, thanks you guys a lot.

That's what the request section is for (The method I used was edge difference instead, but the same principles apply) although I haven't resumed major operations yet.
Title: Re: How to remove the background of the idolm@ster videos?
Post by: animagic4u on December 03, 2012, 09:30:57 pm
Quote from: Gordon1564 on December 03, 2012, 03:51:45 pm
Uhm... After watch that video you provide me, I figure out how to do that. They use an effect called different matte, you will need 3 videos with your characters have the same costume so the only different between 3 videos is the background so the effect will remove the background and keep your idols. But it's seems difficult for me because I don't own any PS3 or Xbox360 to have enough videos and do that effect. Really hope someone wants to cooperation with me... Anyways, thanks you guys a lot.

A similar effect is used in photography for generating a fake lens blur so I can imagine this works.