Colour

Color (American English), or colour (Commonwealth English), is the appropriate of beheld acumen declared through blush categories, with names such as red, orange, yellow, green, blue, or purple. This acumen of blush derives from the dispatch of photoreceptor beef (in accurate cone beef in the beastly eye and added bearcat eyes) by electromagnetic radiation (in the arresting spectrum in the case of humans). Blush categories and concrete blueprint of blush are associated with altar through the wavelengths of the ablaze that is reflected from them and their intensities. This assimilation is absolute by the object's concrete backdrop such as ablaze absorption, discharge spectra, etc.

By defining a blush space, colors can be articular numerically by coordinates, which in 1931 were additionally alleged in all-around acceding with internationally agreed blush names like mentioned aloft (red, orange, etc.) by the International Commission on Illumination. The RGB blush amplitude for instance is a blush amplitude agnate to beastly trichromacy and to the three cone corpuscle types that acknowledge to three bands of light: continued wavelengths, peaking abreast 564–580 nm (red); medium-wavelength, peaking abreast 534–545 nm (green); and short-wavelength light, abreast 420–440 nm (blue).[1][2] There may additionally be added than three blush ambit in added blush spaces, such as in the CMYK blush model, wherein one of the ambit relates to a color's colorfulness).

The photo-receptivity of the "eyes" of added breed additionally varies appreciably from that of bodies and so after-effects in appropriately altered blush perceptions that cannot readily be compared to one another. Honey bees and bumblebees accept trichromatic blush eyes acute to ultraviolet but aloof to red. Papilio collywobbles acquire six types of photoreceptors and may accept pentachromatic vision.[3] The best circuitous blush eyes arrangement in the beastly commonwealth has been begin in stomatopods (such as the mantis shrimp) with up to 12 ashen receptor types anticipation to assignment as assorted dichromatic units.[4]

The science of blush is sometimes alleged chromatics, colorimetry, or artlessly blush science. It includes the abstraction of the acumen of blush by the beastly eye and brain, the agent of blush in materials, blush approach in art, and the physics of electromagnetic radiation in the arresting ambit (that is, what is frequently referred to artlessly as light).

Physics of color

Continuous optical spectrum rendered into the sRGB blush space.

The colors of the arresting ablaze spectrum[5]

Color Wavelength

interval Frequency

interval

Red ~ 700–635 nm ~ 430–480 THz

Orange ~ 635–590 nm ~ 480–510 THz

Yellow ~ 590–560 nm ~ 510–540 THz

Green ~ 560–520 nm ~ 540–580 THz

Cyan ~ 520–490 nm ~ 580–610 THz

Blue ~ 490–450 nm ~ 610–670 THz

Violet ~ 450–400 nm ~ 670–750 THz

Color, wavelength, abundance and activity of light

Color {\displaystyle \lambda \,\!}\lambda \,\!

(nm) {\displaystyle \nu \,\!}\nu \,\!

(THz) {\displaystyle \nu _{b}\,\!}\nu_b \,\!

(μm−1) {\displaystyle E\,\!}E \,\!

(eV) {\displaystyle E\,\!}E \,\!

(kJ mol−1)

Infrared >1000