The paper where the target values originated: https://home.cis.rit.edu/~cnspci/references/mccamy1976.pdf https://home.cis.rit.edu/~cnspci/references/mccamy1976

The paper where the target values originated: https://home.cis.rit.edu/~cnspci/references/mccamy1976.pdf https://home.cis.rit.edu/~cnspci/references/mccamy1976.pdf [1976, PDF] It’s a charming read, with lines like > The orange and Yellow patches visually matched some samples of oranges and lemons, both freshly picked, not dyed. > Some blue flowers, most notably the morning glory of the variety "Heavenly Blue," are prized for their blue color, but frustrate the attempts of photographers to depict them. …speaking as a longtime cultivator of morning glories—I’m gazing at a “Heavenly Blue” variety in bloom as I write [0]—they are absolutely correct; and I love that this fact informs the norms of the entire photographic industry! And, of course, the bottom line: > Having developed a well-characterized test object, we feel obligated to point out that color-reproduction systems hardly ever reproduce all colors exactly. The practical limitations of such processes make perfect color reproduction virtually impossible. [0] https://www.gardenia.net/plant/ipomoea-tricolor-heavenly-blue-morning-glory https://www.gardenia.net/plant/ipomoea-tricolor-heavenly-blu... — and if those charm you, may i recommend the ‘Keiryu’ / ‘Mountain Stream’ variety, which, needless to say, is far more impressive than the photos suggest: https://organicplantit.com/product/keiryu-mountain-stream-morning-glory/ https://organicplantit.com/product/keiryu-mountain-stream-mo...