how do projectors make the color black on white screens?
In: Technology
They don’t. Projectors work by projecting mixtures of light to make colors. White is a combination of all the light colors and black is the absence of all light. So in an image with black portions, no light gets projected to those parts.
A plain white screen is not a very good choice for projected images. What you really want is something that can reflect light very well when hit with light but otherwise will remain dark. This is why projectors work best in darkened rooms and we used to use silver screens to project to.
So basically the more light in the room and the lighter the screen you have, the more washed out looking and overall bright looking will be your projected image.
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