If you have an nVidia graphics card you could try this:-
Start > Control Panel > nVidia Control Panel (or right-click the desktop > nVidia Control Panel). See the image below for the settings you need to change.
*** This will
NOT work on Fullscreen Exclusive *** (it does, however, work on a Fullscreen borderless window). Neither, sadly, will it affect screenshots, in-game or otherwise.
To turn it on and off just toggle the radio button between "Other applications control colour settings" and "Use NVIDIA settings".
Leave the nVidia control panel running so you can Alt-tab to it to switch between the modes as necessary otherwise your normal windows will be excessively bright.
It should work for most places in Endarel, but there are some (especially at night) when you might need to turn your monitor up AS WELL!!
