Color relates directly to electromagnetic wave frequency {color, frequency} and intensity.
frequency
Light waves that human can see have frequencies between 420 and 790 million million cycles per second, 420 and 790 teraHertz or THz. Frequency is light speed, 3.02 x 10^8 m/s, divided by wavelength. Vision can detect about one octave of light frequencies.
frequency ranges
Red light has frequency range 420 THz to 480 THz. Orange light has frequency range 480 THz to 510 THz. Yellow light has frequency range 510 THz to 540 THz. Green light has frequency range 540 THz to 600 THz. Blue light has frequency range 600 THz to 690 THz. Indigo or ultramarine light has frequency range 690 THz to 715 THz. Violet light has frequency range 715 THz to 790 THz. Colors differ in frequency range and in range compared to average wavelength. Range is greater and higher percentage for longer wavelengths.
Reds have widest range. Red goes from infrared 720 nm to red-orange 625 nm = 95 nm. 95 nm/683 nm = 14%. Reds have more spread and less definition.
Greens have narrower range. Green goes from chartreuse 560 nm to cyan 500 nm = 60 nm. 60 nm/543 nm = 11%.
Blues have narrowest range. Blue goes from cyan 480 nm to indigo or ultramarine 440 nm = 40 nm. 40 nm/463 nm = 8%. Blues have less spread and more definition.
wavelength ranges
Spectral colors have wavelength ranges: red = 720 nm to 625 nm, orange = 625 nm to 590 nm, yellow = 590 nm to 575 nm, chartreuse = 575 nm to 555 nm, green = 555 nm to 520 nm, cyan = 520 nm to 480 nm, blue = 480 nm to 440 nm, indigo or ultramarine = 440 nm to 420 nm, and violet = 420 nm to 380 nm.
maximum purity frequency
Spectral colors have maximum purity at specific frequencies: red = 436 THz, orange = 497 THz, yellow = 518 THz, chartreuse = 539 THz, green = 556 THz, cyan = 604 THz, blue = 652 THz, indigo or ultramarine = 694 THz, and violet = 740 THz.
maximum purity wavelengths
Spectral colors have maximum purity at specific wavelengths: red = 683 nm, orange = 608 nm, yellow = 583 nm, chartreuse = 560 nm, green = 543 nm, cyan = 500 nm, blue = 463 nm, indigo or ultramarine = 435 nm, and violet = 408 nm. See Figure 1. Magenta is not spectral color but is red-violet, so assume wavelength is 730 nm or 375 nm.
maximum sensitivity wavelengths
Blue is most sensitive at 482 nm, where it just turned blue from greenish-blue. Green is most sensitive at 506 nm, at middle. Yellow is most sensitive at 568 nm, just after greenish-yellow. Red is most sensitive at 680 nm, at middle red.
color-wavelength symmetry
Colors are symmetric around middle of long-wavelength and middle-wavelength receptor maximum-sensitivity wavelengths 550 nm and 530 nm. Wavelength 543 nm has green color. Chartreuse, yellow, orange, and red are on one side. Cyan, blue, indigo or ultramarine, and violet are on other side. Yellow is 583 - 543 = 40 nm from middle. Orange is 608 - 543 = 65 nm from middle. Red is 683 - 543 = 140 nm from middle. Blue is 543 - 463 = 80 nm from middle. Indigo or ultramarine is 543 - 435 = 108 nm from middle. Violet is 543 - 408 = 135 nm from middle.
Consciousness>Consciousness>Sense>Vision>Color Vision
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Date Modified: 2022.0224