> It’s impossible to plot colors on a chromaticity diagram in a way that isn’t grossly misleading Ok, but... > This particular picture is one attempt at a com

> It’s impossible to plot colors on a chromaticity diagram in a way that isn’t grossly misleading Ok, but... > This particular picture is one attempt at a compromise that will give readers the right conceptual impression, not “broken” accidentally. No, the white point calculations used to make that wikipedia diagram are simply wrong. It's a recurring problem. Not a question of handling out-of-gamut colors, but of mislocating colors within it. For instance, this fourmilab page[1] and associated specrend code, had incorrect white-point-related math for many years (the code was fixed, the page I don't recall), which IIRC, caused 'front page of the New York Times' "Universe is green"-level professional embarrassment.[2] Here's a less bogus diagram.[3] Note the white point being close to the Planck curve, in contrast to the wikicommons diagram. Some of the conceptual impressions seem quite unfortunate, reinforcing common misconceptions. That blackbodies (the Planck curve) can be colorful (other than red white and blue). The associated misconception that visible candle light is blackbody radiation. The extremely common astronomy education misconception that the Sun and many stars are yellow (for white points more perceptually relevant than blue Vega). A challenge in shifting science education towards more integrated and operational understanding, is so much content being variously incorrect, and thus not fitting together. > Stick to the u'v' chromaticity diagram. Yes, perceptually uniform color spaces are nice. Hmm, and that raises an interesting question: might incorrect diagrams be less common there? Being younger, and perhaps with open source libraries and eyeballs, replacing coding things yourself from a book, and simply copying diagrams stumbled on somewhere without checking them. A question for google image search... [1] https://www.fourmilab.ch/documents/specrend/ https://www.fourmilab.ch/documents/specrend/ [2] https://pages.jh.edu/news_info/news/home02/jan02/color.html https://pages.jh.edu/news_info/news/home02/jan02/color.html https://www.nytimes.com/2002/01/11/us/scientists-paint-universe-as-a-vast-sea-of-green.html https://www.nytimes.com/2002/01/11/us/scientists-paint-unive... https://pages.jh.edu/news_info/news/home02/mar02/color.html https://pages.jh.edu/news_info/news/home02/mar02/color.html [3] https://tex.stackexchange.com/questions/422862/fill-area-of-the-spectral-curve-with-cie-chromaticity-fading-to-generate-a-cie-c/423324#423324 https://tex.stackexchange.com/questions/422862/fill-area-of-...