[mcrdev]

I was never a fan of green screen as opposed to blue. It always seemed to be blue then for some reason green seemed to become flavour of the month. In analogue terms blue gives the largest signal for the keying equipment to work with (chromakey etc works on colour-difference signals not the actual colour itself) and green pretty much gives the smallest so I never really quite knew why the change. Of course today’s cameras are more sensitive overall and digital signal processing techniques have transformed what can be done.

I was taught blue was the preferred colour in analogue composite days as it was the smallest contributor to most skin and hair tones, allowing for a better key. The switch to green came with analogue component as there is more detail available in the derived green signal than would be in the blue signal - the benefits of the extra detail outweighing the more challenging key generation required.