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Originally Posted by XAKEP
why is a blue screen not purple?
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The reason why they use blue and green screens is for the simple fact that those 2 colours are the least dominant on a person's skin and in nature.
When performing greenscreen, you're telling the computer to eliminate a certain color from the image, well, if you were to use a white backdrop, everything that is white (including glares, eyeballs, teeth, etc) would be taken out of the image.
But green and blue are less likely to be found in images (especially the blue and green they use), so you have less chances of unwanted artifacts being lost.
Its that simple