Using any test disc you will notice that the plunge low patterns cannot display the blacker than black (below level 16 in sdr) even when rising the brightness to max. On video this means that lower black levels are crushed. Adjusting the brightness slide on the bluray player by 1 or 2 steps allows to display the blacker than black test patterns. Same with the white clipping test patterns. The vpr cannot display anything above level 238.Adjusting contrast on the player allows to display the whole scale, but the countereffect is white shifting to yellow. You can achieve a 242 to 244 without any shift. However this means that the the brightest levels are clipped. Same for hdr. I still have to send a report on these settings to Optoma, but they have already been informed of what is going on. I doubt they will do anything with any of the information received so far unless they start loosing sales. And with vpr on the verge of disappearing from home theaters, I doubt they will do anything even for future reiterations of their products.