I'm tired of different video black levels which take down the quality of the video.
Some examples, depending on your brightness level you might or might not see the difference:
If you can't see the differences in the black levels, use ColorPic and read the color values.
Dimming the full screen apparently isn't the solution, so, I'm looking for something to quickly change the brightness and contrast levels of YouTube videos on the fly. And if possible, automatically...