Inverter for Nocturne is a free software tool that is designed to revert the Nocturne inversion. This software can also do some more things for you such as make your colors monochrome or simply change the brightness of all images.

This software is very easy to use and works on all web pages that have images and video, such as Youtube, Google, Dailymotion, or Vimeo.

Just right-click on any image on the web page and select the "Invert All Images" option to undo Nocturne inversion. You can switch between "day" and "night" modes.