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How Does a Movie Projector Show the Color Black?
There’s no such thing as black-colored light. So how can we see Darth Vader on a screen?
If you put a small drop of water on your phone screen, it will act as a magnifying glass and you can actually see the RGB lights inside. If that was the case, you couldn't tell the difference between a projected black color and the screen without the projector even on. So when Darth Vader makes his appearance in the original Star Wars, striding through Princess Leia’s spaceship?
Or read this on Wired