ELI5
[https://i.imgur.com/Y3SxynO.gif](https://i.imgur.com/Y3SxynO.gif) (image for your convenience)
Using the additive colour theory, when I add equal parts of red & blue together it is magenta.
But what happens if I add two parts red & one part blue together? Is it still “pure” magenta? Or has it shifted off to the side of red, a little?
Context: I’m creating a game using additive colour theory and I’m a bit perplexed on this one.
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Yes, if you change the proportion, the result will change. Have you never mixed crayons or aquarelle paints? In your example two part red + one part blue will end up being something like (depending on saturation) something like #C80064 (or 200,0,100) in RGB
You seem to be mixing intensity with color. These are different things. When you talk about color, the most you can have is 100%. So 50% red and 50% blue gives magenta. 66% red and 33% blue is a different color, a bright red or pink. This is all discussing the hue dimension. Saturation is a separate dimension, all these colors are fully saturated. If you mix in white, you reduce the saturation, making the colors more pastel.
These is no agreed-to standard set of names for colors. Or, there are many standard sets of names for colors which are all different from each other. Your choice of interpretation.
Intensity is a completely different thing, it’s about how bright the light is, number of photons per second, independent of these color models.
On the RGB color wheel, the color #FF0080 (i.e. 100% of red pixels lit, 50% of blue pixels lit, and 0% of green pixels lit), is usually called “Rose”.
Obviously if you combine Red and Magenta additively you’ll get a very *bright* Rose. Difficult to represent that on a computer screen, since it has a limit to how bright it can get. If you wanted to be scientifically accurate you’d have to instead show it as Maroon (#800000) + Purple (#800080) = Rose (#FF0080), which probably isn’t very satisfying.
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