Maintenance for the week of April 27: https://forums.elderscrollsonline.com/en/discussion/691699/
· [IN PROGRESS] EU megaservers for maintenance – April 27, 2:00 UTC (April 26, 10:00PM EDT) - April 27, 16:00 UTC (12:00PM EDT)
· [IN PROGRESS] NA megaservers for maintenance – April 27, 3:00AM EDT (7:00 UTC) - 5:00PM EDT (21:00 UTC)
If you have an Nvidia card in the 900 series or later (maybe earlier), there is Nvidia Freestyle. This is enable in GFE under "Experimental". It supports a number of games, including ESO, with nothing extra needing to be installed.
You setup a hotkey of your choice (I use Alt-Z) to access the menu in-game and see post-process shading and changes in realtime.