I’ve got to take small issue with the term “superblack” to describe values which are less than a certain value (Ron gives the < .1 example). The "super-" prefix usually means "higher than" or in typography, "above". So when I think of a spectrum where 0 is black and 1.0 is white, "superblack" seems to suggest a value greater than Ron's arbitrary value of .1 when in fact it is the opposite. For clarity I suggest we adopt the term "sub-black"; this also allows for logical continuity with other terms, such as "sub-pixel" sampling.
Or in acoustics, “sub bass” refers to frequencies below an arbitrary threshold — say, 50 Hz — and are sent to the subwoofer.
Devil’s in the details, I know 🙂
Thoughts anyone?