What color is indigo? Pictures

Indigo [diàn] color is one of the cool colors. Indigo is blue-purple, darker than purple, but more reddish than blue. It can be classified into both the blue and purple systems. The web color for indigo is #blueviolet. Is a color lighter than pigment indigo but darker than screen indigo. The default indigo RGB on the screen is (75,0,130), code #4B0082.

Indigo is a color with a frequency of 670~710THz (corresponding to a wavelength of 450~420nm in the air) in the spectrum. It is between blue and purple. It belongs to the high-frequency part of the visible light in electromagnetic waves. Its frequency is second only to purple light. Generally, Generally refers to the blue-violet color between blue and purple, which is a common color system.

Color characteristics:

Indigo in the spectrum is close to screen indigo (Electric Indigo). The screen indigo here is close to the spectral indigo on a computer screen. But in fact, spectral indigo cannot be displayed correctly on a computer screen because spectral indigo is outside the display color gamut of the International Commission on Illumination color spectrum, so screen indigo is only an approximate color close to spectral indigo.

Note that according to the CIE standard, the standard frequency of blue light (hue 240 degrees) among the three primary colors is 690THz, corresponding to the wavelength of 435nm in the air, and it is a purplish blue (positive blue hue 210 degrees, frequency 640THz, corresponding to the wavelength of 470nm in the air). The frequency of violet light is 750THz, corresponding to the wavelength in air (400nm), so it exactly meets the definition of indigo.

Reference for the above content: Baidu Encyclopedia-Indigo