Green Screen Workshop

In our Green Screen workshop we were taught the basics of how green screen works, and the use of Premiere Pro in order to change the backgrounds. The backgrounds can also be changed through a live feed, like we were using in the session.
Green screens actually used to be blue, but it was found that green is better for technical reasons and the fact that people often don’t wear that kind of green, nor there are many people with green eyes. It has been found, however, that blonde hair and a green background can be a little bit awkward as the blonde can pick up some green. To light it, you can for example use 4 lights at the front, 2 at the side and one at the back. Lighting like this makes people pop out a bit more with depth.
The technology behind the green (or blue) is chromakey. You can substitute this colour for a background, nothing (which appears as black), or to white out a room.
There are some quick tips and tricks that we also found out during this session including not to stand too close the the screen as you will pick up a green tinge. The trick is to light the wall, put the person the same distance as their height away from the wall and then light them too. If you light the two different spots then there’s no green spill.
This is also helped by the material used as it is a high reflectivity and a high saturation material or paint. A polyester material is also better than cotton  as this doesn’t crinkle or crease. This is useful when trying to make the background as tight as possible, and this is normally done using weights (or a filled water container). If it is a cloudless day you can even use the sky as your background – as long this is even lighting.
With live chromakey, the green screen needs to fill the whole image. In post production, you just need enough green around the person and then you can fill everything else in green. Wen filming someone in a black room, you light the person and not the room in order for them to pop out. Again, you can alter this in post production.
Other tips and tricks that we learned also included the infinity curve. This is where the fabric curves before it hits the floor, meaning there aren’t as many lighting issues with the LED soft flood lights. With photographs as well, it is better to put the backgrounds slightly out of focus because if it is in focus all the way, it looks fake.
Overall, we had lots of fun and I really enjoyed learning about the technology behind green screen. I am unsure as to how I may use it in my projects, however I feel as though it could be a possibility.

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