You guys crack me up. I'm glad that you stomp on me when I need it. It keeps me in check http://www.avsforum.com/ubb/biggrin.gif
Dave, Yes, in my hypothetical setup above, if you drop the brightness down one more "unit" you have WHITE=600, BLACK=0. Infinite contrast! Woo Hoo! If the device is truly black
at 0 IRE, you have infinite contrast. Truly. It's theoretically possible, and maybe even actually possible in the real world with some CRTs or maybe the upcoming Grating Light Valve laser-based projectors.
If you drop to 599 "units", it's still infinity (no black hole). It's infinity all the way down. In fact, WHITE=1, BLACK=0 is still infinite contrast. Not that it would produce anything watchable (at least, not without a Fevrish lens), but that's another story.
Anyway, I didn't say that this was the way that it actually works, I was just saying that it was possible to reduce light output and increase contrast at the same time, which was the original question.
If it was actually this easy, all the manufacturers would do it to get their contrast specs up. It would require a fair bit of engineering to get right.
Oh...D-ILAs are another good example! 300:1 out of the box...lots of brightness. After calibration, more like 500:1 to 650:1, with a loss of brightness.
How can you have higher contrast with a darker picture? Focus on the black level.