Originally Posted by Floydster
Yes about the 8 bit video. Seems like they are always stingy with the bits, even in the DACs. I agree with 2160 not being enough. 4000 should be dazzling though. There is a good documentary on Netflix streaming called Side by Side comparing film to digital. There is a company named RED that is already producing digital cameras with a resolution on of 5,600 or something like that. That exceeds projection in theaters. 4000 lines is supposed to be real enough to give people car sickness who are prone to it, so it must be pretty darn real looking. I think that directors will start using a wider color gaumut once it's available.
You seem to be mixing up vertical vs. horizontal resolution. The current standards for both consumer Ultra-HD and for commercial digital cinema use 2160 vertical pixels. The horizontal pixel count is 3820 for the consumer Ultra-HD standard with 1.78:1 image ratio (same at today's HDTV 16 x 9 aspect ratio standard) while the Digital Cinema industry (i.e., your local theater with a '4K' digital projector) uses a slightly wider image aspect ratio of just under 1.90:1 which require a few more horizontal pixels (i.e., 4096 total horz. pixel count) to fill out the wider image. The term "lines of resolution" is really from the analog days and is more complex measure because in includes anything that could degrade what is technically possible based on the above pixel counts. More specifically when applying this term to a digital projector it includes the effects of the projector's optics, convergence accuracy of the red, blue an green sub-pixels and the image processing (encoding/encoding, scaling, etc.). There is also luminance resolution vs. chroma resolution. Finally many people seem to get confused in that the vertical lines of resolution is directly dependent to the horizontal pixel count while the horizontal lines of resolution is directly dependent on the vertical pixel count (more background on this the HERE
). By the way the bit depth has increased to 10-bit and 12-bit as per the Ultra-HD standard (ITU-T Rec. BT-2020) and the color space has also been substantially expanded by that same standard.
Red Digital Cinema has recently introduced a commercial 6K digital camera, but after the video is captured by the camera it will normally be downscale to 4K or even 2K for editing into the final movie and distribution to the movie theaters. A consumer 4K UHD format, either distributed by a future optical disc, by internet download, or by satellite or over-the-air broadcast, has the potential of providing essentially the same resolution that will be seen today at a modern commercial theater equipped with a 4K digital cinema projector (Sony, Christie, Barco) with the potential for even better performance in same areas (e.g., better image contrast).
Looking a few years into the future there are already the some of the standards coming forward for both consumer video and commercial digital cinema for 8K video. However other than a few technology demos and trials (such as those be done in Japan by NHK), the first really full-time 8K programming sources and production 8K displays are probably still 7 or more years away.
.Edited by Ron Jones - 6/18/13 at 8:08pm