Ever mixed blue and yellow paint as a kid and magically created green? So why doesn't it work that way on your computer screen? The secret lies in the difference between how we perceive color in the real world versus how computers display it.
We're used to the RYB (Red, Yellow, Blue) color model, where yellow absorbs blue light, leaving red and green, which we perceive as yellow. When you mix blue and yellow paint, they absorb most colors *except* green, which is reflected back to your eye.
Computers, however, use the RGB (Red, Green, Blue) model. Instead of *subtracting* colors, they *add* light. Each color channel emits light. When blue and yellow (which is essentially red and green light combined in RGB) are 'mixed', the red, green, and blue light essentially overlaps. Combining Red, Green and Blue at the same intensity results in gray or a desaturated color rather than the expected green.
So, don't blame your computer! It's just speaking a different color language. Understanding RGB vs RYB unlocks a whole new world of digital color manipulation!