i kinda understand the difference between subtractive and addictive colours but i don’t understand why we use green instead of yellow for lights
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Red, green and blue work well because they match the color detectors in the human eye. Human eyes have red sensors, green sensors and blue sensors. Those are called cones.
– Red cones are sensitive to the end of the rainbow with reds and oranges.
– Green cones are sensitive to the middle of the rainbow, greens and yellows.
– Blue cones are sensitive to the blue end of the rainbow.
All of the cones overlap somewhat. For example, orange will trigger both the red cones a lot and the green cones a little. Your brain says “I can tell it’s orange because I’m getting a really strong signal on my red cones and also a moderate signal on my green cones.”
**Every color that humans can see is some combination of the signals from those red, green, and blue color-detecting cells.**
Some animals have more or fewer types of color detecting cells. They can detect colors that humans aren’t able to see. (I.e. two different shades that look identical to humans might look completely different to those animals.) If humans had different detectors sensitive to different colors; then red , green, and blue wouldn’t work as primary colors for us.
There are also sensors in the eye called rods, those pick up brightness only, but not color.
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