How does a film projector show the colour black?

Courtesy of Rhett Allain

However what concerning the colours of a video projector? It basically does the identical factor. Nonetheless, as a substitute of a bunch of tiny RGB lights, it tasks the RGB colours at totally different areas on the display.

Challenge the colour black

Now we’re prepared for the enjoyable stuff. How does a projector mission black mild? Black mild could be the absence of any mild, as we noticed beforehand. How can we handle to not plan something? Let’s first contemplate a display like a tv. When you’ve got three small lights (purple, inexperienced, blue), you may create a small black dot by merely turning off the three coloration lights at that location. Increase, it is black!

So, is it doable that you just simply flip off the projector to make it darkish? This cannot be true, can it? If that have been the case, you would not be capable to inform the distinction between a projected black coloration and the display with out the projector even being turned on. Sure, that is precisely the way it works.

Test it out: Within the following picture, I am projecting a slide that is half black and half white. The slide takes up a lot of the display.