2160p/Fourk UhD hdr streaming vs 1080p Bd Sdr thread

[Geoff D]

Originally Posted by bruceames.

I wonder though, although HDR10 is mastered at 1000 nits, how many of those highlights actually get close to that? Probably most of the highlight only get up in the middle range anyway 400-600 nits. After all, the new DV TVs only get up to that, and people are going gaga over bit rate starved VUDU HDR content. So it makes me wonder how much of this upper end actually being used?

Is the difference in brightness between a 20 watt light bulb and a 200 watt light bulb the same proportionally between 100 and 1000 nits?

I dunno about the light bulb question but overall, yes: that's what HDTV test were getting at when they did that whole 'not good for daylight viewing' thing, that the average light levels on show aren't majorly different from one format to another, it's only in the brightest specular highlights where the highest 1000 nit peaks are being registered. I've done some checking with my colourimeter on the highlights but not on lower brightness parts of the scene, I'll compare some of those when I get a sec.

Besides, the UHDA's HDR requirement for OLED maxes out at 400 nits anyway, does it not? And I ain't saying my LCD TV has a contrast ratio anywhere remotely near what OLED can do so it's not an apples to apples comparison but still: the 400 nit peak on my own set is eminently capable of providing a distinctly superior dynamic range to 100 nit SDR (though being able to pass something of the WCG helps tremendously though, I'm not sure a SDR 709 conversion would look as good).