[ELI5] How does chameleons know what color to change and how they do they change?

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[ELI5] How does chameleons know what color to change and how they do they change?

In: Biology

They get the impulse from their vision and from their skin accepting different wavelengths of visible light, then a protien reaction sends different minerals stored in the blood to create the color and design, thats why parisian chameleons are so well dressed and so-cal chameleons look sluty.

Ignore McGician, he’s clearly trolling.
Chameleons don’t actually use their color change for camoflauge much.
They use it for social signalling, and reaction to temperature.
So it’s kinda like how you “know” to turn your skin red when you are cold or embarassed.
It’s a reaction to internal physical processes.

Chameleons actually change color by using tiny crystals of guinine in their skin.
By moving them closer together or further apart they change how light bounces off the crystals, and thus change color.