Recently, I bought a new Dell U2414H monitor and connected it with a DisplayPort cable and everything was fine. Until the moment, when I had to use HDMI connector as one of my laptops has only this output available. To my surprise the colours were washed out and very blend.
I did some research and discovered that my notebook thinks that the monitor is a television and the graphic card – Intel HD 4600 and Nvidia GTX 760M in my case. And therefore it tries to send a limited RGB spectrum to the monitor.
The problem was on Windows but is not limited to it as I tried the HDMI output on a mac and the result was the same.
The best solution to overcome this issue is to use the madVr Nvidia & Intel RGB Levels Tweaker and Force PC Levels (0-255).
Restart your PC and the colours are stunning again. And I can get back to my photo editing.