How do projectors and screens show the color black if black is the absence of light?

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How do projectors and screens show the color black if black is the absence of light?

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Projectors show the color black by turning off all of the lights in the room. TV screens show the color black by making the screen absorb as much light as possible. Which is why movie theaters turn off the lights when the movie starts, but you can still watch TV in a brightly lit room.

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