Indigo: Difference between revisions
| [pending revision] | [pending revision] |
No edit summary |
No edit summary |
||
| Line 7: | Line 7: | ||
h=275|s=100|v= 51 |
h=275|s=100|v= 51 |
||
}} |
}} |
||
'''Indigo''' is the color of [[ |
'''Indigo''' is the color of [[blue]] between 440 to 420 [[nanometre]]s in [[wavelength]], placing it between [[blue]] and [[violet (color)|violet]]. Light that contains both [[Violet (color)|violet]] and [[blue]] frequencies is also indigo, but this is not how indigo is defined. Like many other colors ([[Orange (colour)|orange]] and [[violet (color)|violet]] are the most well-known), it gets its name from an object in the natural world - the plant named ''[[indigo plant|indigo]]'' once used for dyeing cloth (see also [[Indigo dye]]). |
||
Indigo is neither an additive [[primary color]] nor a subtractive primary color. It was named and defined by [[Isaac Newton]] when he divided up the [[optical spectrum]] (which is a continuum of frequencies). He specifically named [[seven]] colors primarily to match the seven notes of a western musical scale, because he believed sound and light were physically similar, but also to link colours with the (known) [[planet]]s, [[day]]s of the [[week]], and other lists that had seven items. |
Indigo is neither an additive [[primary color]] nor a subtractive primary color. It was named and defined by [[Isaac Newton]] when he divided up the [[optical spectrum]] (which is a continuum of frequencies). He specifically named [[seven]] colors primarily to match the seven notes of a western musical scale, because he believed sound and light were physically similar, but also to link colours with the (known) [[planet]]s, [[day]]s of the [[week]], and other lists that had seven items. |
||
Revision as of 19:57, 28 June 2006
- This article is about the color. For other meanings, see Indigo (disambiguation).
| Indigo (closest in gamut) | |
|---|---|
 Color coordinates | |
| Hex triplet | #4B0082 |
| sRGBB (r, g, b) | (75, 0, 130) |
| HSV (h, s, v) | (275°, 100%, 51%) |
| CIELChuv (L, C, h) | (20, 62, 279°) |
| Source | [Unsourced] |
| B: Normalized to [0–255] (byte) | |
Indigo is the color of blue between 440 to 420 nanometres in wavelength, placing it between blue and violet. Light that contains both violet and blue frequencies is also indigo, but this is not how indigo is defined. Like many other colors (orange and violet are the most well-known), it gets its name from an object in the natural world - the plant named indigo once used for dyeing cloth (see also Indigo dye).
Indigo is neither an additive primary color nor a subtractive primary color. It was named and defined by Isaac Newton when he divided up the optical spectrum (which is a continuum of frequencies). He specifically named seven colors primarily to match the seven notes of a western musical scale, because he believed sound and light were physically similar, but also to link colours with the (known) planets, days of the week, and other lists that had seven items.
The human eye is relatively insensitive to indigo's frequencies, and some otherwise well-sighted people cannot distinguish indigo from blue and violet. For this reason some commentators including Isaac Asimov have suggested that indigo should not be regarded as a color in its own right but merely as a shade of blue or violet.
Indigo is also the Spanish name for India, which is one of the earliest known places to have used the Indigo flower as a dye for clothes. Other areas to use Indigo dye in the ancient World included Egypt and Greece.
The British in India during the Raj often forced locals to plant Indigo in their fields for use in English mills for dyeing cotton. Growing Indigo in a field contaminates the soil for certain other food crops. This led to famines in many areas of India during the British Raj.
Web Colors
Indigo dye is closer in color to Midnight Blue (Hex: #191970) than to the web color Indigo (Hex: #4B0082), which is more violet.
See also
| |
| Gamma rays | |
| X-rays | |
| Ultraviolet | |
| Visible (optical) | |
| Infrared | |
| Microwaves | |
| Radio | |
| Wavelength types | |
 | This color-related article is a stub. You can help Wikipedia by expanding it. |