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Keying footage with motion blur

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Joe Stas
Keying footage with motion blur
on Mar 6, 2013 at 4:47:50 pm

Hi
I have had a search around the internet for a solution to this but not found anything that I can use yet. Perhaps the footage can't be fixed? I'm not sure.

Anyway, I have some motion blur on my green screen footage and obviously once I do the keying with primatte it's coming out a tad funky, as you can see by the picture below.

http://i22.photobucket.com/albums/b324/joe_stas/ScreenShot2013-03-06at16435...

Is there any way to make this look better or is that just the nature of motion footage with a shutter of only 1/50?
Thanks


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Vishesh Arora
Re: Keying footage with motion blur
on Mar 6, 2013 at 6:26:29 pm

Joe

It seems to be the Natural Motion Blur of Camera due to the fast movement of subject and Slow Shutter Speed.

Vishesh Arora
3D and Motion Graphics Artist
Films Rajendra

Blog:
http://digieffects.wordpress.com

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Joseph W. Bourke
Re: Keying footage with motion blur
on Mar 6, 2013 at 8:14:06 pm

You don't say which version of AE you have, but if it's AE6, there are some incredible new masking feather tools available:

http://tv.adobe.com/watch/sternfx/mask-feather-tool-in-after-effects-cs6/

Joe Bourke
Owner/Creative Director
Bourke Media
http://www.bourkemedia.com


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Joe Stas
Re: Keying footage with motion blur
on Mar 6, 2013 at 8:23:34 pm

Yes sorry I am using CS6

The room was very well lit in a professional studio. The reason it looks so flat is because I am yet to grade and shot it that way on a dslr using cinestyle. Should I be doing some basic grading before keying?


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Dave LaRonde
Re: Keying footage with motion blur
on Mar 6, 2013 at 8:36:09 pm

It's DSLR footage? Color grading before keying won't help one bit.

You can't reinvent what isn't there, and with DSLR footage, there is a boatload of color information that was eliminated as the video was recorded. Oh, it looks just fine, but you're a human being and not a computer using color information to eliminate portions of the picture with great precision.

Dave LaRonde
Former Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Dave LaRonde
Re: Keying footage with motion blur
on Mar 6, 2013 at 8:19:53 pm

"A tad funky" is an understatement. We only see the final product and not the original, so it's tough to speak in anything but generalities.

In general, a good key depends on 1) the quality of the lighting and 2) the quality of the footage.

The lighting looks like there isn't any: it appears to have been shot outdoors, and we can't see the green screen to ascertain the ratio of light on the subject versus the green screen.

The quality of the footage refers to how much color information is actually recorded. If, for example, if it was shot on a DSLR, there is just enough color information to fool the human eye, but not a computer.

So there are your two generalities. And you're right: the comparatively low shutter speed didn't help one bit, but I don't think it was the ONLY offender.

Dave LaRonde
Former Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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