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What is Hue?

Hits:         Date:2015-07-04
what is hue?

What is Hue?


Apples are red, lemons are yellow, the sky is blue; that’s how we all think of color in everyday language. Hue is the term used in the world of color for the classifications of red, yellow, blue, etc.Also, although yellow and red are two completely different hues, mixing yellow and red together results in orange (which is sometimes referred to as yellow-red), mixing yellow and green results in yellow-green, mixing blue and green results in blue-green, and so on.The continuum of these hues results in the color wheel shown in Figure 1 .



The other main aspects of color appearance are colorfulness, chroma, saturation, lightness, and brightness.


Usually, colors with the same hue are distinguished with adjectives referring to their lightness and/or chroma, such as with "light blue", "pastel blue", "vivid blue".


There are so many colors in the world. A color expression often means ten different colors to ten different people. “Name this color” is a very difficult thing to do, so we need a colorimeter to make quantifying colors simple. 


Hue is the term used for general classification of color — the region of the visible spectrum (380 to 700 nm) — in which the greatest reflectance of light occurs. Hues perceived as blue tend to reflect light at the lower end of the spectrum, greens in the middle region and reds toward the higher end. Figure 1 shows spectral sensitivity corresponding to that of the human eye. 
Lightness/darkness can be measured independently of hue. For example, the lightness of a lemon can be compared with the lightness of a cherry. Saturation describes the vividness/dullness of a perceived color and, like lightness, can be measured independently of hue. 
Among the most widely used color spaces for defining and mathematically expressing these attributes are the CIE’s Yxy color space, established in 1931; the 1976 L*a*b* color space; and the L*C*h color space. Other color spaces, such as CIELUV, Hunter Lab, developed by Richard S. Hunter, and the Munsell color notation system, also are in use. 
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