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Green screen color match


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#1 David Edward Keen

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Posted 08 February 2018 - 09:03 AM

Do multiple green screens in a single shot have to be the exact same green?

 

I have a large one made of fabric hanging in front of the spaceship set, and then within the set I have little paper ones (rectangles for screens with animations later) 

 

 


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#2 aapo lettinen

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Posted 08 February 2018 - 09:50 AM

it should be no problem if the different colour screens are completely separate areas from the fabric screen. 

it may complicate keying a little bit if you for example stitch a larger fabric screen from multiple different tone parts so that the colour varies considerably within the screen. 

 

if the screens are completely separate (for example one behind the model spaceship and another screen on the window of the ship pointing towards camera) then it will be no problem because you can just mask the smaller screen and key it separately.

you may want to do this anyway because of the lighting conditions so should be no problem at all... technically they would not even need to be the same colour if they are completely separately keyed. you could for example use blue for windows and green for background if needed


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#3 David Edward Keen

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Posted 15 February 2018 - 11:26 AM

Curious thing now: The shot is in a spaceship. Which is to say, in my Dad's Toyota. Out of the front windshield is a green screen where it will be stars.

 

Inside the set there's a prop with a screen, the screen is green screen paper.

 

I need a different image on that prop than is out the window, but both green screens are in the frame so they seem to both have the stars. Is there a way to treat the two greenscreens separately? 


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#4 Landon D. Parks

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Posted 16 February 2018 - 03:38 AM

Curious thing now: The shot is in a spaceship. Which is to say, in my Dad's Toyota. Out of the front windshield is a green screen where it will be stars.

 

Inside the set there's a prop with a screen, the screen is green screen paper.

 

I need a different image on that prop than is out the window, but both green screens are in the frame so they seem to both have the stars. Is there a way to treat the two greenscreens separately? 

 

Do you have previous experience with composition? Green screen work is hard to pull off effectively unless you have practice with proper compositing techniques. Trying to explain it through text is rather hard, and how you need to approach the scene would depend on the setup of the scene itself. What software are you using?

 

The BEST software for compositing on a budget is Blackmagic's Fusion, which is free - and very powerful.

Based on your description:

If the prop inside is meant to be a screen that displays something, you might not even need to greenscreen it. The correct way I'd handle it is to corner pin the 'replacement' over the green, tracking it through a program like Mocha. In fact, I probably wouldn't use green - I'd use matte black with 4 tracking markers in each corner.

 

But yes, you certainly can treat multiple green screens differently in the same scene - mostly through separate masks.


Edited by Landon D. Parks, 16 February 2018 - 03:39 AM.

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#5 David Edward Keen

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Posted 16 February 2018 - 11:31 AM

thanksLandon,spacebardoesntworkoncinematography.com

 

i'mlearningcompositing

 

i'llcheckoutwhatyousaid

 

thanks


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