If you are on windows you can use this awesome tool to have it globally: https://zerowidthjoiner.net/negativescreen

nice plus: inverted mode with correct colors (only brightness inverted)

You could even write your own translation matrix. It's a bit tricky at first, but fun. e.g. true black and white without greys.

For your own matrix this might help (but definitely another format :/ ):

https://kazzkiq.github.io/svg-color-filter/

http://alistapart.com/article/finessing-fecolormatrix