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NASA Launching 4K TV Channel
An anonymous reader writes: NASA has announced that it's partnering with Harmonic to launch a new TV channel that delivers video at 4k resolution (4096x2160). The channel is called NASA TV UHD, and it'll go live on November 1. Content will be generated by cameras at the International Space Station and on other NASA missions, as well as any 4K content they can remaster from old footage.
4k and UltraHD are not the same format!
http://www.extremetech.com/ext...
(Digital Cinema Initiative) 4k resolution means 4*1024=4096 columns, and generally 2*1080=2160 lines (with a resulting aspect ratio of ~17:9). It has been used for several years in movie projectors.
UHD-1 means 3840x2160 (16:9), which is 4 times the "Full HD" of 1920x1080 (or, as it's often abbreviated, 1080p, with 1080 for the number of lines, and p for progressive, 16:9 ratio implied)
(While there's also UHD-2, which is 4 times UHD-1 at the gigantic 7680x4320.)
Most screens sold as "4k" are in fact only "UHD-1", except some specific ones, generally used for very high-end video editing, now usually advertised as "True 4k" (which includes a larger color gamut, among other things).
There's also an issue that if you run at 4096x2160, 60Hz, 12-bit JPEG2000 colors, the overwhelming majority of HDMI and DisplayPort cables won't be able to carry the signal due to insufficient bandwidth (it would seem that some monitors can use two cables as a workaround).