I'm not getting this from Wikipedia. It's what I learned in physics class in public school. Didn't you do the experiment with the prism that refracts the white light that includes the spectrum of colours? This is just an empirical question, but I'm confident that colour depends on the properties of light, the surfaces of objects, and the eye-brain system of processing that information.

I say it's just an empirical question, but maybe it does matter to Buddhism. The extreme empiricism that's implicit in Buddhism might entail solipsism, in which case you'd have a hard time crediting the independent reality of any external thing such as leaves and light. It's all one interconnected whole for Buddhists, and the distinctions between the parts are based on egoic fantasies and delusions. Does that mean you can't take seriously the scientific explanation of how colours are formed?