By Trevor Weir


Many people use of chroma keying in green screen process for many different reasons. It has its place in image placement in photography and when films are edited to put characters, objects and scenes where they would not be. To show you how this is done I have included examples in this article to give you a better understanding.

Colour keying is another name that chroma keying is called. It is so called because this process is all about colours when adding two frames or separate pictures together to become one so that the desired effect is achieved.

There are many cases where chroma keying is used in this day and age. You may be aware that a screen is used during weather reports which are why it is able to change as though a large television set were behind the weather reporter; however it is just a blank screen which has the images added later. Another circumstance where this method is used is during films that have both animated characters as well as people.

This is great for putting a person or character on the moon or in the sun without them actually having to go there. You can put characters into a film that have never set foot on the set and all that is needed is clever lighting, a computer and a green backdrop.

When you are programming, there are certain values applied to represent the pixels. There is a certain representation for each one which could be one letter, a number, symbol or both. The same goes for whether the programming is referring to the background (coloured) or what ever you wish to put in front of it.

The alternative references used can depend on two things. That is the programme that you want to use as well as if the programmer wishes to change them. So that the image of choice can be applied to replace the screen these codes are very important.

Now that the digital world seems to have many more benefits over film it seems that more people are using it. To get the best from your editing it is better to use the green screen rather than the blue as the end result has better clarification which makes for better viewing. To make sure you get the look you want there may be circumstances where you have to use a different colour screen such as a red or blue one. This is so that colours do not clash.




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