Spiderwick Chronicles tagged posts

CGI – Blue vs. Green Screen Chroma Keying

CGI – Blue vs. Green Screen

Chroma key compositing, or chroma keying, is a special effects / post-production technique for compositing (layering) two images or video streams together.

Almost all studios nowadays use green screens, however there was a time when blue chroma key screens were the main stay.

One of the things the general public are unaware of is whichever colour is used, has to be avoided in any of the set pieces, props and costumes/clothing of the person being filmed because the colour will pick up and show any background overlay (such as a mountain scene) – a big no-no.

Green chroma key screens became the ultimate universal ‘CGI canvas’ because with the blue chroma key there was more ‘bleeding’ around the actors and set items making the foreground images a little blurry with...

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