Storme if on Windows + nVidia, lower digital color vibrance.
This is a random picture from google.
I have a physical setting at my screen which is called color vibrance, and depending on the model, I turn it down to 8, where 20 is the max, and 1 is absolutely grayscale.
The reason I say that, is because neither color temperature, nor hue will make changes how much vibrancy you will have, not even at lowest brightness.
Nvidia says:
Digital Vibrance To compensate for poor lighting conditions when viewing your desktop, use the Digital Vibrance slider to increase the crispness/richness/intensity of the desktop colors.
I think: Digital Vibrance affects gamut and saturation.