Comment 7 for bug 1785764

* That "lime green" problem is something we noticed a year or two ago. Some people had lime green and others (me!) just had washed out colours, specifically only in Chrome and some image viewers (sound familiar?). The fix for everyone was to delete and disable the default colour profile in Settings. So maybe that's all you're missing... Remove it.

* The resolution "4K" or "1080p" is irrelevant here. What is more relevant is that it's a TV connected via HDMI. And TVs connected via HDMI are subject to the HDMI spec which says:

  "While using RGB, Limited Range shall be used for all video formats
   defined in CEA-861-D, with the exception of VGA (640x480) format,
   which requires Full Range."

But what I hadn't told you yet is that despite it being in the standard, not all manufacturers honour it. Because dishonoring it like a proper monitor yields better image quality, and that's likely what HDMI monitors (not TVs) will do by default already. But your monitor and TV's default settings might be the other way round. Regardless, please check the HDMI RGB range (or "Black Level") settings in BOTH your Nvidia driver and in the TV and monitor own menus. To get a correct picture they need to be the same in both the graphics driver settings and in the TV's own settings menus. I can't give you any more specific instructions because it's different for every model of display :(