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Is this green screen footage OK?

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Oliver de MorasséIs this green screen footage OK?
by on Nov 26, 2012 at 11:35:21 am

We are currently testing a Sony PMW-200 video camera. We are shooting at full HD422 1920x1080 25P. Been playing around with the settings. Here 3 test pictures:

1. 20121122_0050. Full auto, ATW 5500K, F5.6, Shutter auto
2. 20121122_0051. Manual. ATW 4900K, F3.4, Shutter 1/50.
3. 20121122_0052. Manual. ATW 4900K, F2.8, Shutter 1/50.

We need to get a good key and deliver high-quality e-learning HD videos. Not really sure which settings I should be using. Any comments regarding the footage, lighting & focus etc. would be really appreciated.

I have done a very rough key based on the last picture 3 using keylight. Used a screen colour near to the left shirt and then clip black 20 & clip white 70. Here is the result.


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Nurbek SagynbaevRe: Is this green screen footage OK?
by on Nov 26, 2012 at 12:47:09 pm

I think the one shot with automatic settings (20121122_0050.png) is the best for green screen.

20121122_0051.png has too much green tint overall and will be more difficult to key.
20121122_0052.png is too bright and has some blown areas.


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Vishesh AroraRe: Is this green screen footage OK?
by on Nov 26, 2012 at 1:13:18 pm

Oliver

I agree with Nurbek. The first shot gives the best result by applying AE's Keylight(1.2) plugin at default settings.

Second image has a lot of green spill over it and third image is too bright.

Vishesh Arora
3D and Motion Graphics Artist
Films Rajendra

Blog:
http://digieffects.wordpress.com

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Oliver de MorasséRe: Is this green screen footage OK?
by on Nov 26, 2012 at 1:25:37 pm

Thanks for your feedback. What parts of the footage are you looking at when saying too much green spill or too bright? I also thought that one should avoid auto and try to setup manually - what is the camera doing right and I am doing wrong?


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Nurbek SagynbaevRe: Is this green screen footage OK?
by on Nov 26, 2012 at 1:39:23 pm

There are several aspects you should keep close eye on:

1 - White balance. This one is easily fixable in post production but getting white balance right during shoot means less work later.

2 - Keep the subject away from green screen to avoid green spill. Couple of feet should do the trick.

3 - Brightness. Try not to overexpose the image. In my experience fixing an underexposed footage is easier than overexposed.


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Oliver de MorasséRe: Is this green screen footage OK?
by on Nov 26, 2012 at 1:56:54 pm

Thanks. Regarding white balance, please see How to white balance correctly. Any feedback welcome.


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Nurbek SagynbaevRe: Is this green screen footage OK?
by on Nov 26, 2012 at 2:04:47 pm

I just use a plain white A4 paper. It doesn't really matter where in frame it is located as long as it is not lit directly by light source. Your camera seems to get the best white balance in automatic mode.


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Kevin ReinerRe: Is this green screen footage OK?
by on Nov 26, 2012 at 2:54:26 pm

Like others have said, number 1 looks best. It also helps to do a quick color correction before keying. I often find that keylight has trouble with black and introducing noise. So be aware of that with that suit.
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