What wavelengths(dominant) the primary RGB colors are supposed to be in sRGB color space in nanometers? The Context
I am exploring the idea of making a DIY spectrometer(and colorimeter) for testing various material samples for interior visualization. It's sort of a hobby project for my curiosity and pleasure that might end up useful for my actual work with CG.
The Question
I am struggling to find a trustworthy information source for light wavelengths sRGB color space primaries are supposed to be. They are supposed to be the same as in REC.709 as far as I understand. Are the actual wavelengths of sRGB RGB primaries defined and if so what are they in nanometers?
The primaries of sRGB are not pure wavelengths, they are color mixtures. Their true definition is in terms of CIE chromaticity coordinates. That said, for sRGB, the red primary is close-ish to 610nm, green is very roughly 555nm, and blue is close-ish to 465nm.
The Rec. 2020 RGB space, by the way, is actually defined using pure wavelengths for the primaries: R=630nm, G=532nm, and B=467nm.