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"Purple" is not a spectral color. Violet is, but the purples are a mix of violet & red, or red & blue, or such. Red/green/blue are one set of primaries. Lots o
by SAI_Peregrinus 2y ago
"Purple" is not a spectral color. Violet is, but the purples are a mix of violet & red, or red & blue, or such.
Red/green/blue are one set of primaries. Lots of artists working with paint use red/yellow/blue. Inkjet printers use cyan/magenta/yellow. Which colors are "primary" depends on the medium.
- carlob 2y agoNot quite RGB or CYM(K) depends on whether you are adding or subtracting colors i.e. if the light is transmitted or reflected.
- SAI_Peregrinus 2y agoYes, that's a change of medium. You can also have color-equivalents in non-visible light, such as in frequency-division multiplexing in radio links or fiber optics. Every broadcast TV channel is a different spectral radio color (well, a small range of them).