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In the next three

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videos, we'll be looking at green screen
and how it's used in video production,

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planning to film with your green screen
and how to edit it in post-production.

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The term 'green screen'
just means the colored background

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you wish to turn transparent
to remove from your shot .

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Everybody has witnessed footage
that used a green screen.

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They're a large part of how films are made
in the western world.

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For example, the Star Wars
prequels, the Marvel Cinematic Universe

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and the Pirates of the Caribbean saga
all heavily relied on green screens.

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While screen screening
may seem like an advancement

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that has been introduced
within the past 30 years or so.

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one of the earliest examples
of the idea of green screening was used

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by a director called Edwin S.

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Porter in 1903 for his film
The Great Train Robbery.

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So why green?

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Because it is the color furthest away
from the shade of human skin tones.

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Alternatively,
a blue screen is sometimes used.

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These are useful
when shooting in an environment

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which already uses
a lot of shades of green.

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For example, a forest.

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Originally, though,
a blue screen was used while

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recording footage on old style film
pre-digital age.

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Once familiar,
using a green screen with a basic intent

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isn't much harder than standard
video editing, if planned correctly.

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Going into a green screen shoot
for the first time, though,

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there are numerous important
considerations to be made.

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The first consideration to make
is the size of the green screen

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you'll be using
and the space you will use.

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The length of the screen itself
and the width of the crossbar

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is information that can save
potential problems down the line.

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If it's a smaller green screen
and a larger room, for example,

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is there anything green in the background
that shouldn't be that could interfere

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with the footage?

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Do you need to change the camera lens
that you intended to use

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in a process

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that requires

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a lot of attention to detail, make sure
you start to give it from the off.

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Rigging
the green screen can differ depending

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on the type of green screen
you're working with.

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For instance, if it's a smaller, blanket
looking version, these are often rigged

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the same way a backdrop is before
school picture day

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consisting of two stands which attach
to a pole which mounts the green screen.

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From here, you can decide the right height
of your green screen.

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Judging this should be based

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on the height of your subject,
the size of the space you're working with,

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and what type of camera lens
you'll be using.

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Green screens do come in all shapes
and sizes, but all offer the same benefit.

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As mentioned
before, a common type at entry

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level is mounted on two poles
and hangs down and out.

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Collapsible green screens are also popular
and useful and handy for filming

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in smaller locations or for covering
windows, door frames and windshields.

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The top of the line for green screening,

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though, is an entire studio
dedicated to it, which looks like this.

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These types of green screen are industry
standard,

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and are used prominently in Hollywood.

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Whilst the process can take some time,
it can be sped up by careful planning.

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This begins with a shot list.

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By planning the shots
you wish to use a green screen with,

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you're then able to block them out.

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This is essentially a practice
of the subject position where they will be

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on the day of shooting and become familiar
with how to light and position them.

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More on
both of these will be in the next video.

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But by doing this,
you will already be rehearsed

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for the actual day
and feel more confident in the next video.

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We'll look at how to position a subject
both in motion and static.

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In addition to the correct
way to light a green screen.