Green Screening

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This topic has 1 voice, contains 4 replies, and was last updated by Avatar of iturnblackkeys iturnblackkeys 4133 days ago.

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June 1, 2003 at 2:08 am #4201
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iturnblackkeys

I’ve got the recommended color of green and the material all set to film on but I have two questions about greenscreening. If you have 3 elements to your shot, and the elements on the left and the right side of the frame are stationary and the middle elements are moving. Do you greenscreen the moving part or the stationary part and why? Secondly, I get the message about how the green screen must be evenly lit and to avoid spill and that but how do you physically do that? How do you know if the greenscreen is perfectly lit, before you put it in the Mac and Final Cut. Is it possible to tell on the monitor? And if you put your elements to be filmed in front of the green screen and it is lit well and then you light to element to be filmed does it matter if any of the lit on your subject or object if projected onto the greenscreen? Would really appreciate some feedback, shooting this weekend. Thanks!

JK

June 1, 2003 at 2:29 am #4202
Avatar of jay
jay

In order:

If you want the background plate you are trying to insert to appear behind both the moving and stationary elements, that would be ‘greenscreening’ both of them. Usually when you key the colour out it is removed from all parts of the frame in which it appears. Depending on what software you are using, you can use other methods of matting in (stationary in particular) elements. AfterEffects, for example, is very good for that sort of thing.

Lighting evenly can be tricky. It helps to diffuse your light somewhat – you can do that by pointing it through a thin piece of cloth or by bouncing the light off of a white card. Try using duplicate light sources.

Certainly you can judge how evenly lit it is by looking at the monitor (Has it got light and dark patches? That’s bad.) but the best way is to try a few sample frames before you commit to a scene. Can you key the colour out as much as you’d like? Is there a trouble spot anywhere?

Having your scene lights interact with the greenscreen will often cause headaches later. Increase the distance between the background and where you are shooting or try lighting the scene from the side to minimize the effect on the greenscreen.

I hope this helps – I had some trouble trying to figure what what exactly you wanted to know. If you want more info, just ask.

-j

June 1, 2003 at 3:32 am #4211
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Cometgreen

Not much to add on after zirk’s post, but I would recommend that you test it out yourself before starting the actual shooting. Take a shot of the current scene. Check to see if you get what you want and if your lighting is acceptable for keying. Then, once you know your settings are good to go, start filming.

I hope I don’t insult you or anything, but you’re sure that nothing in your scene, other than the greenscreen, has a strong color of green, right? Some people actually expect the greenscreen to be the only thing keyed out, and end up wasting all that time because one of their “actors” has a light green costume. That’s why I suggest you test it out first.

Good luck with your project.

Cometgreen

June 1, 2003 at 6:09 am #4228
Avatar of iturnblackkeys
iturnblackkeys

Thanks for the input I’ll be testing it out and shooting tomorrow and I’ll let you know how it goes. Thanks again!

JK

June 1, 2003 at 6:41 am #4229
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iturnblackkeys

If I got green gloves that match the backdrop and light them equally and not obsure the object I am manipulating can that work in post, in terms of eliminating the gloves?

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