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Comment by randyrand | Hacker News Reader

Dell might agree. 4K does not appear anywhere on that webpage.

AFAICS it doesn't meet all aspects of the TV world's 4K spec, specifically the new colour regime. (99% of https://en.wikipedia.org/wiki/Adobe_RGB_color_space has to be a smaller colour space than https://en.wikipedia.org/wiki/Rec._2020 surely.)

The article you linked on Rec. 2020 says:

> In coverage of the CIE 1931 color space the Rec. 2020 color space covers 75.8%, the digital cinema reference projector color space covers 53.6%, the Adobe RGB color space covers 52.1%, and the Rec. 709 color space covers 35.9%.

So yes, Adobe RGB covers less of the reference color space than Rec. 2020 (4k/UHD), but more than Rec. 709 (HDTV).

No display of any kind meets the Rec. 2020 gamut spec. It's more a future proofing step than a realistic target. The fact that the primaries are sat right on the single-wavelength line indicates an eye towards future laser projectors though - the gory details of how the decisions were made start at page 27 of http://www.itu.int/dms_pub/itu-r/opb/rep/R-REP-BT.2246-2-201...

Well they do mention it indirectly

Ultra HD 3840 x 2160 packs in four times the resolution of Full HD

which is quite a long way from actually using the term "4K"

Anyone trying to sell monitors won't use the term 4K.

Dell is smart and won't ever use 4K while selling monitors, thats why they said four times HD instead of 4K.

Which makes sense because 4K resolution exist in the field of digital cinema, digital cinematography and digital television.

4K means ~4000 pixels wide, not "four times HD".

Full HD has a defined pixel size, and they're simply saying that this screen has twice the resolution in both directions.

Ultra High Definition or UHD includes 4K UHD and 8K UHD.

4K UHD is 2160p which is 3840 pixels wide by 2160 pixels tall, which turns out to be four times as many pixels as 1920 × 1080

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