Emanuel Berg (12022-07-25): > How much green and red can a blue color have and still > be blue? > > And how little blue can it have? > > I have a programmable keyboard so I've done some of that [1], > this new idea would be to have a all-blue, all-green etc keyboard randomized > each time, the random would then be, for each key, random R, > G, and B, only the three interval of possible values for those > obviously can't be ... the same. > > And it can be made even more complicated than that if those > intervals aren't even independent of each other, e.g. if you > don't have a lot of red, and _a lot_ of blue, then you can > have MORE green compared to when ... etc > > RGB intervals anyone? Ideas?
Several things we need to know about colors to talk accurately: - Naming colors is very cultural. And it possibly influence the way we think about them; I think it is one of the cases where Sapir-Whorf is somewhat valid. - There is no such thing as “real” white light, because there is no such thing, mathematically, as a spectrum with the same amount of each component, since it depends on the parametrization of the component space (in layman words: a “uniform” spectrum in wavelength is not uniform in frequency and reciprocally). The best we can do is know that our eye evolved for the light of the Sun, and therefore is optimized for its light, and white is anything that looks like the Plank spectrum at 5800 K, although 6500 K usually appears somewhat whiter. - The color triangle possible by the RGB scheme is a tiny part of the colors that light can express. It cannot show real oranges, yellows, turquoises, only washed down approximations, and it is even worse for indigos and violets. - Our brain lies to us about colors all the time. We see the same object the same color under sunlight and under the light of a measly incandescent light bulb. And, in this modern age, we have seen screens all our lives and have learned to imagine the colors are as saturated on screen that in real life. You might want to read these two web pages: https://blog.xkcd.com/2010/05/03/color-survey-results/ http://www.madore.org/~david/misc/color/ Regards, -- Nicolas George
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