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AE CS4 - tips for getting green screen to sit nicely?

May 13, 2012 1:15 PM

Hey, guys.

 

I'm about to start on a project that's largely green screen. Have a nice screen & lighting and the results are keying well. With that in mind, I'm working to improve on making the talent sit nicely in the backgrounds, which are typically stills of rooms or other physical locations. Here are the things that are on my radar at present, would appreciate any thoughts you might have on improving the results.

 

  1. Make sure lighting of green screen shot matches that of set / background as closely as possible, e.g. light source direction, color temperature, etc.
  2. Measure sets & use this information to properly scale talent when placing
  3. Apply slight blur to background to emulate depth of field

 

 

Along the lines of 3), I find that a lot of green screen stuff I see doesn't really sell in part because there are very distinct and hard boundaries between the talent and the background. I'm also wondering if it's worth making a couple of passes at blur, one on the background, and the second by slightly enlarging the inverted mask from Keylight and applying a blur to that (a rather vague statement as I haven't experimented with this yet). The general idea to blur from the edges of the talent outwards just a bit, with a lighter blur, and blend that into that of the background.

 

On the surface, green screen stuff is supposed to be easy. Get a clean shot that keys well, drop it into your comp and you're done. However, seems to me that getting the clean footage to place is only the beginning in order to have something that truly looks natural.

 

What other tips and tricks do you guys use?

 
Replies
  • Currently Being Moderated
    May 13, 2012 5:12 PM   in reply to Christopher Duncan

    > I find that a lot of green screen stuff I see doesn't really sell in part because there are very distinct and hard boundaries between the talent and the background

     

    Light wrap is your friend:

    http://provideocoalition.com/index.php/ryoung/story/how_to_light_wrap/

     

    For other tips for keying, including tips for acquiring footage for keying, see this; there's a lot of good information here:

    "Keying"

     
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    May 13, 2012 5:44 PM   in reply to Christopher Duncan

    > So what's new and exciting on your side of the street?

     

    I'll give you two hints:

     

    http://adobe.ly/HDKYpx

    http://adobe.ly/HCGNMJ

     
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    May 13, 2012 11:26 PM   in reply to Christopher Duncan

    I'll leave it to others to recommend specific plug-ins and utilities beyod what comes with After Effects.

     

    Regarding making a light wrap: I made a video about this process for the After Effects CS6: Learn By Video course. Let me see if I can make that video available for free... Even if not, I used roughly the same approach as described in that article on the ProVideo Coalition website.

     
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    May 13, 2012 11:39 PM   in reply to Todd_Kopriva

    Hi Todd,

     

    I have competed the "Learn by Video" course for CS5 now. Lots of great tips and tricks. I really enjoyed it. It would be great if the Light Wrap video could be made available.... :-)

     

    I am looking forward to taking the rest in - piece by piece!

     

    Pierre

     
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    May 14, 2012 9:27 AM   in reply to Christopher Duncan

    Christopher Duncan wrote:

    On the surface, green screen stuff is supposed to be easy. Get a clean shot that keys well, drop it into your comp and you're done. However, seems to me that getting the clean footage to place is only the beginning in order to have something that truly looks natural.

    What you're asking about is the art of filmmaking. Most amateurs don't understand light wrap, lighting motivation (matching source type and direction and color) or simulating depth of field in the composite. However, most keys do not require such elaborate techniques and attention to detail. This is the difference between simulation and a simple background replacement; the difference between creating a scene and creating a weather show. The needs are different.

     
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    May 14, 2012 1:25 PM   in reply to Christopher Duncan

    > It's all down to talent and skill.

     

    ... and patience. Lots and lots of patience. There's a reason that the list of compositors/rotocopers/etc is so very long at the end of a movie.

     
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