Originally Posted by stepmback
I used the white flashing pattern... I was able to limit it somewhat, several steps above 235 ( I believe 240).
I was guessing that's what you might have been doing, because my SXRD TV causes gamma to drop at the high end if you cause above whites to not display that way. I'd guess that if you lower contrast and have all the bars to 253 flash that the 0%-100% gamma might measure more typically than the measurements you posted. On the other hand, depending on how Sony's computer software works for your projector, it might be possible to use that high of a contrast and to adjust gamma with the computer and get things to work that way.
By what you said I think you're already around the maximum available contrast at all possible. You absolutely do not want levels less than 235 to stop flashing on the pattern you were using. The thing is that using that high of a contrast can introduce other trade-offs such as color shift or a drop in the high-end gamma. Color shift just relates to the sort of information on the RGB graph. The Adjust Gray section of the current disk has two above white windows that could be measured to relate if red, green, and blue are balanced (no color shift or near D65 point), being how you said you have to display some above white and couldn't clip right at 235.
What test pattern is best for setting contrast and exactly how do you set it?
Generally there really aren't any patterns for setting contrast on a digital display. All that pattern can really do is to quickly show if levels are lost. I'm not aware of any white-level type patterns that clearly show anything other than a loss of levels. The issue is just that the patterns don't necessarily relate any possible trade-offs of using a high contrast, such as relating things like color shifts or a drop in gamma. On the other hand though, your colorimeter can relate gamma and if your grayscale (including above white) stays near the white point.
Anyway, I figure there are basically 2 directions you could go:
1) Lower contrast, which will likely raise gamma based on your comment that you've previously measured a 1.9 gamma. From the user setting I saw in the manual, only lowering contrast or gamma 3 have much chance of raising gamma, assuming you've already set brightness so that only 17 and up flash.
2) Being how #1 isn't necessarily in line with your intentions, you could try keeping the current contrast setting and try the Sony gamma adjustment program. If you currently have any above-white color shift that might still be present even after using the Sony gamma adjustment. Of course I have absolutely no idea how the Sony program works so I can't anticipate any possible issues with this route, but it's what I would probably try to figure out myself.