Originally Posted by ChrisWiggles
Joe: The patterns I mean are: T 12 Chp 14 and T 12 Ch 15. Also, T 12 Chps 2-13 have quite a few patterns with PLUGE for setting black level. These BTB PLUGE bars may clip. Chps 14 and 15 show the whole range, and also white, so I find them more useful in assessing the system, and where, if at all, there is clipping.
OK, maybe I am a two-headed monkey. I went back to check everything again, just to be sure my chain had all its links unkinked. Everything I said above was accurate, except I couldn't get the DVE pattern to display WTW (using the dots as a reference point) without reducing the Oppo's contrast setting to -2.
So, I tested a little further. I set the Lumagen DVI level to PC and the Oppo brightness and contrast back to 0. Just as a point of clariication, the Lumagen accepts either DVI-Video or DVI-PC and outputs as DVI-Video or DVI-PC. The Optoma accepts DVI-Video or DVI-PC. In all these tests, the Optoma is set up to receive DVI-Video and the Lumagen processor is set up to output DVI-Video. That remains consistent in all this.
So, here's the arrangement that is so confusing:
1. Oppo brightness and contrast at their factory defaults of 0.
2. Optoma set to receive DVI-Video.
3. Lumagen video processor set to output DVI-Video to the Optoma.
4. Lumagen video processor set to receive DVI-PC from the Oppo DVD player.
With these settings, the DVE ramp patterns are visible from BTB to WTW (title 12, chpt 14). Unless I misread everything above, a device set up to receive a DVI-PC signal is going to clip BTB and WTW. If the Lumagen is expecting DVI-PC (and that really means something) then how can I see BTB and WTW bars (clearly outside the dots that mark those BTB and WTW transitions on the bars)?
Is this a matter, Chris, of all bets being off, and the manufacturers make up their own rules as they go? Or am I just too thick to see how this all works?
This test tends to send me in the other direction and think the Oppo is best left at DVI-PC levels.
The Lumagen video processor, BTW, defaults to DVI-PC level input and DVI-PC level output, and it gives this piece of advice: "If unsure, use the defaults." Even after a Lumagen "Restore," its DVI level defaults back to DVI-PC and has to be reset manually, even though all the other Lumagen settings are restored to their saved states.
Perhaps, at this point, the only serious recourse is to press the manufacturers to supply the relevant information. My experience with doing that in the past has been mixed, though.