Control the strength of a colour

One of the most beautiful things about living in the tropics is that the suns goes down really quickly. Not that I don't like long summer nights like we would get in the Netherlands, but I just love the magic hour when the sun goes down and all the colours get really intense, especially the red soil. I never really thought about why this happens, but after doing this exercise I realize that this intensification of colour takes place because of the diminishing of the amount of light. 

I took five photos of the back of a bright red chair, all with different apertures but the same shutter speed. As expected the ones with the widest aperture are underexposed and the ones with the smallest overexposed, but as you will see, the strength of colour seems to get less when there is more light reflected from the surface. 

Going from overexposed to underexposed the hue goes from almost pinkish to bordeaux red (I'm not sure if this is an English term for describing that colour, just think of the red wine). The colours get more saturated and intense, but also darker.  

This is something to keep in mind when I deliberately over or underexpose images. I wondered what happens to the colours when I adjust an image during post processing. Do the colours become more intense as well when I lower or up the exposure? So here are a few screen shot of a colourful imag. One with the exposure it was shot at, an overexposed and an underexposed. As you will see on the sliders and diagram, the colours do get more and less intense. 

But then, if the colours get so dark that the intensity is not really discernible, the photo will not turn out very well either. I guess it depends on the choices I make of how I want the image to look and what I it is that I want to portray. I have learned that lighting does have a big influence on the colours, so it is something I will keep in mind.