Different proportions of red and green produce different colors.
For example, mixing red and green in equal proportions produces a color that is a heavy gray; when there is less red and more green, the resulting color is a dark green; and when there is more red and less green, the resulting color is a dark green.
The red, green, blue three primary colors of color light with different ratios can produce a variety of different color light, these principles can be used in many ways, but also brings a lot of convenience.