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

Question

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

In: Technology

Answer 1

Human s enses are logarithmic. You don’t really see black, your eyes will see a dark gray in the absence of light (eisengrau).

You perceive black where, logarithmically, the image has less light.