In fact, the chameleon adjusts the skin tone very much. In the case of the high-crown chameleon, which is often used as a pet, it tightens the body when the nerves are tight. At this time, the pigment cells on the body will shrink, causing the color to become dim.
When excited, the body will swell, and the pigment cells will be stretched out, showing bright emerald green.
If you see that the color of the chameleon is not the same as the surrounding environment, it may be that they are not in a good mood!