Some silly postprocessing to try and get a C64 look, with dithering, pixelation and color-
Just a video to test it on in this case, from the lovely looking trailer for Cyberpunk 2077.
You can also play a bit with the sliders below.
Note. You need a modern browser that supports WebGL for this to run the way it is intended.
For example. Google Chrome 9+ or Firefox 4+.
(If you are already using one of those browsers and it's still not running, it's possible that you
have old blacklisted GPU drivers. Try updating the drivers for your graphic card.
Or try to set a '--ignore-gpu-blacklist' switch for the browser.)