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Thursday, June 2, 2011

Why Film Makers Use Of Chroma Keying In Green Screen Process

By Trevor Weir


I would like to tell you about the use of chroma keying in green screen process so that you have all the information you need to understand all terms used. There are many uses for the coloured whether for photograph or film software. There is software that makes your job easier but without the knowledge it may all seem like a foreign language.

Chroma keying is not the only name that this kind of programming is known by. It is also known as colour keying for a very good reason. This is that you put two screens together, the one being the green screen, and then to the screen you can add pictures or people to the front or back of the frame or picture.

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 enables those who want to create a different looking scene to that you could create without this to make a person or character look as though they are in a different country or even at the bottom of the sea when really they are standing against a green background.

So that the computer can understand what you want it to do, the pixels (each and every one) are given codes. This could be anything from one letter, symbol or number upwards. In addition to this so that the programme is able to understand whether you want their to be a change to the person or image that is really there or to the green background codes are allocated to them too.

Different references are used by different programmes which is why I could only give an example. You can alter the references with some programmes and of course if you know what you are doing. To alter the images you should be aware that it is only with these designated codes that changes can be made. This is made easier with certain programmes.

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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