Why do computer screens use RGB if red blue and yellow are the primary colours?

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Why do computer screens use RGB if red blue and yellow are the primary colours?

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There are different primary colors depending on the medium: pigment or light. Red, Blue and Yellow are the primary colors of pigment; Red (Cyan), Green and Blue are the primary colors of light. Also, in pigment, the absence of color is white and all the colors combined are black (kind of); in light the absence of color is black and all the colors combined are white.

The primary colors are just a set of three that can’t be mixed from other colors. Otherwise, there’s not much special about them when it comes to visual displays.

Red, green, and blue can be more easily differentiated by the cones in the human eye than many other colors because they are of (relatively) long, medium, and short wavelengths in comparison to each other. That way, screens can produce, and we can see, a wider range of colors than we could if the primary colors were used.

It’s more Cyan (which is sorta blueish), Yellow, and Magenta (which is sorta
redish).

Paints are stuff that absorb some color, but not others.

Cyan paint absorbs all the Red and nothing else.
Magenta absorbs all the Green and nothing else.
Yellow paint absorbs all the Blue and nothing else.

So it’s the exact opposite of what a monitor does.

So if you have a white paper, you do the opposite you would do with a monitor screen, and you get the same image.

EG, If you want white on a place in a monitor, you turn on all RBG indicators to the max, if you want white paper, you don’t put any ink.
If you want yellow, you turn on Red and Green to the max and leave Blue to 0, if you want to make a paper yellow, you put the not Blue Ink, which is Yellow.