What color background can improve the contrast with a red light source?

Using red light source can improve the contrast of green background. In order to distinguish the observed object from the background to the greatest extent, the complementary color light source is usually selected, and the red light source can be used to improve the contrast when the green background is selected. Reasonable light source color can make the feature have enough gray value difference with the surrounding area. In order to distinguish the observed object from the background to the greatest extent, complementary color light sources are usually selected. If the characteristic object is green, the contrast can be improved by choosing a red light source. The contrast between green and red is very big.