Originally Posted by Ian_Currie
So what I'm trying to point out here is that the Lumis doesn't seem to perform like a projector with high native CR.
I'm not sure what the other projector is you were referring to (maybe a CRT) and this may or may not apply here, but one thing a higher on/off CR could reasonably allow is a higher gamma (more like a CRT's natural gamma). This could then end up affecting images that don't seem like the type that would benefit from high on/off CR, where they are really benefiting more from the higher gamma that is leaving more CR between say 20%stim and 80%stim.
I'm not sure if that made sense, but coming at it from another direction, a lower on/off CR could mean that a display tops out at about 2.2 gamma to look good just because where the images are all dark there isn't enough CR between say 0%stim and 10%stim or 20%stim, if the same gamma is used for all images. In the case of a 2.2 gamma the CR between 80%stim and 20%stim would be about 21:1. Now if the display is modified with much higher on/off CR then these very dark images may be less of a problem and now a person may be able to reasonably go to a 2.4 gamma. With a 2.4 gamma the CR between 80%stim and 20%stim would be closer to 28:1. A somewhat small difference at about 30% more there, but still a difference.
With the dynamic iris of the Lumis I'm not sure how much the above applies, but it could and to really see if it is better than the previous generation I think it makes some sense to make sure that the gamma has been optimized (including for the environment) for it. After that it is done it is possible that some images that don't seem like they would be helped by the higher dynamic CR of the DI system actually would be.
BTW: I'm not sure how much control there is over the gamma with the Lumis. I recall that on Art's HT5000 there were some high choices for gamma and we used some higher ones after playing around a little bit. He was coming from those 2 G90s and I don't know if the choices actually mapped to those gammas (I don't think it was final software at that point).