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Originally Posted by old_tv_nut
I'm afraid what you have posted is very confused. There is no "RGB standard." What there is, is ITU Recommendation 709, which is used for digital TV worldwide including in the US - the same gamut as the sRGB standard commonly used for jpg digital still pictures. The extra yellow pixel does extend the gamut of this TV beyond rec 709, but when it is properly calibrated the extra range is not used and it does not exceed rec 709, because that is what is broadcast. There have been several proposals to extend the gamut of media, particularly blu-ray discs, but as far as I know, no extended gamut discs have been produced. Each proposal has some drawbacks. Extended gamut standards for production and for broadcast using new digital standards are under discussion in various standards committees.
When you mention 1931, that is the date of publishing of the CIE standard observer, which uses mathematically defined non-realizable primary colors X,Y,Z so that all visible colors may be defined with positive values of these primaries. Some of the proposed production standards use XYZ or other primaries that can cover the full visual gamut.
Obtaining an extended gamut can be done with three-primary displays rather than with an additional yellow (simpler mathematically to get correct), and is currently available in wide-gamut computer monitors as well as very high end specialized professional video monitors used for cinema editing. A wider gamut in the display is also natural for laser displays.
Experienced Photoshop users know that an extended gamut monitor (especially with extended red) has to be "profiled" so that when an image comes from a narrow gamut source, the system reduces the gamut of what is displayed to match the source. Otherwise, colors come out over-saturated. The same thing can happen with the extra yellow pixel, but there the distortion is in colors other than flesh tones, so the viewer has no ready reference of what the color should be and may like the higher (though incorrect) saturation.
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Thank you for taking the time to clarify my comment. What you said is pretty much the way I understood it. Joe Kane is one of the leading proponents of educating the industry and public as to a proper color and extended color gamut displays and we have read his papers.
My point is modern television sets are capable of reproducing color beyond the "old standard" and why should we be bound to the old standard. I understand the reluctance of the industry to push back because of the investment required for such a change. They may resist, but 4K is here and more to come. (Yes I know, not true 4K) NHK of Japan is working to make Super HiVision available in time for the next Olympics held in Japan. The format is wide color gamut, 8K and even 16K, multi channel audio. We will fall behind if we do do not adopt an advanced television standard.
I know that the calibration brought my display back to the studio standard, but to my eye, I see a broader green/yellow spectrum of colors. We noticed the difference having owned prior sets. A nice side benefit of the Quatron is the reduction in size and addition of pixel elements.