how do projectors make the color black on white screens?
In: Technology
They don’t – it is impossible for a projector to make a surface darker, only lighter.
The projectors get around this by primarily being used in dark rooms and projecting on special materials that help to isolate and direct light.
They also take advantage of a little quirk in our brains where the perceived lightness/darkness of a surface is impacted by the surrounding areas. We’ve all seen the [shadow illusion](https://en.wikipedia.org/wiki/Checker_shadow_illusion#/media/File:Checker_shadow_illusion.svg) where squares A and B are actually the same color, but our brain sees them as different because of the surrounding colors. Thanks to this, something can appear ‘black’ on a projector, despite the fact that it is actually just the color of the projector screen.
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