Originally Posted by PlasmaPZ80U
at this point, do we really need to bother with blue filters/blue-only modes or can't we just use meters and calibration software to make sure both color decoding and gamut are right in one sweep?
Wrong question, the question is, "What do you do if you don't have a meter and software?"
The distinction to remember here is that color decoding
is the process of turning a YCrCb value into an RGB value. This is purely a mathematical function (even in the analog domain.) It has only *one* correct answer. And that answer is what the SMPTE Color Bar Chart in combination with primary isolation was designed to solve. It doesn't really matter what the display's primary chromaticities are, the method still works to solve the decoding equations.
The problem with the above is that to have an accurate gamut and color rendition, the primary chromaticities do matter ... along with white point and gamma ...
So to answer your original question above ... maybe it helps to have the decoding equations setup correctly, maybe it doesn't ... or maybe we just bypass all of this, put an expensive 3D LUT capable video processor before the display and just manipulate the source material to match the display's setup. ... Dealer's choice.