What is Chroma Key

00635U (0-00-02-13) with backgroud and smoke effect

Would you like to lie on the white beaches of the Maldives or walk on the moon without actually travelling there? Well, the solution is ‘Chroma Key’!

Chroma key is a technique used in post-production or real-time in order to replace a background.  Using an editing software, the editor points which colour to make transparent and recover with another picture. In theory, it is possible to use any kind of colour but you have to be careful because any items which are classified under the indicated colour range will be made transparent.  For example,  if you use a red background and the subject wears a red T-shirt, you may be left with a floating head and legs!

The main characteristic of this process is the monochromatic background; it means that it is necessary to use a one-coloured backdrop which is usually green.

WHY GREEN?

The main reasons why green screen is a popular choice:

– it is the furthest away from skin tone and in this way it is easier to separate the person from the background.

– digital cameras are more sensitive to green

– can be lit with less light than that required for blue screen

– is a less common colour for costumes.

It is important to note that the background should be evenly lit as shadows could damage the chroma key process.

WHO CAN DO IT?

When you think about this kind of process you may immediately think about a big expensive Hollywood production, but fortunately things have changed for small-medium crews who want to shoot on green.

Live Vision provide all the things needed for a professional chroma key shoot, affordable and easy. We even have two kinds of chroma: a spongy removable curtain and a hard cyc so we can adapt to your needs.

You just have to bring your ideas, and we will do the rest.

By Sara Aversa and Nieves Matias