Why does inverted color exist?
There's a reason why, historically, colour inversion has been used. It's because the value of any pixel is simply negated (which turns dark pixels light, and light pixels dark, as well as altering the colour). This is a very quick operation for the CPU/GPU to perform, so is still efficient.
What are the colors inverted?
What Is Color Inversion? Color inversion is a photo effect that flips all colors to their opposite hue on the color wheel. For example, white becomes black, green becomes magenta, and blue becomes orange.