Courtesy of Rhett Allain
But what about the colors from the video projector? It basically does the same thing. However, instead of a few small RGB lights, it displays RGB colors in different places on the screen.
Displaying black color
Now we’re ready to have fun. How does a video projector emit black airy? A black airy would mean no airy everyone airy as we saw earlier. How not to design anything? First, let’s consider a TV-like screen. If you have three little lights (red, green, blue), you can make a little black dot by simply turning off the lights for all three colors in that spot. Boom, it’s black!
So is it possible to simply turn off the projector to get a black image? This can’t be true, right? In this case, it would be impossible to distinguish the projected black color from the screen, even without the projector turned on. Yes, that’s exactly how it works.
Check this out: In the image below, I am displaying a slide that is half black and half white. The slide takes up most of the screen.