Chroma key
A chroma is a technique used in film, video and photos to replace a portion of an image with a new image. This is done through a process called chroma keying, which means selecting a colour and removing every instance of that colour in the image. Any image place 'behind' this image then becomes visible. The most common colours used in chroma keys are blue and green, because these colours are least likely to affect the foreground.
Chroma keying can be done in post-production or in real-time. Television is most likely to use real-time and films uses green screens during the production and post-production process e.g. the film 'Avatar.'
Example of a Green Screen
Green Screen
Our group has used the green screen for the music video. The first time our group used the green screen, we had used different coloured lights while filming with the green screen. We realized that by having different coloured lights shone at the green screen, it would distort the green screen.
This made it difficult for us to add a background, as the green screens colour kept on changing due to the lights. We learnt from our mistakes and had ensured to not have any lights shone towards the green screen. Our group filmed the music video again, and this time we were able to add a background.
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