16.

I got an 8 when I tried it the other day, but I blame it on the (otherwise excellent) TN panel I’m staring at.

Yup. Most LCDs (especially from Dull) are 6 bits per colour, and then they dither themselves. Did everyone else have vertical bars somewhat darker than surrounding regions in teh final gradient?

Indeed, what was that final gradient meant to represent? There was no graduation from top to bottom, only left to right. Sure, it's a hue test, but then why the blank spots only cover the bottom of the screen?

Got bored half way, but on the bit i did i was right.

Whoa FREAK.

...I got 3. I had three white blocks in a row distinguishing between green-blue and blue-green.