E-Hue
Acronym Definition
EHUE Environment Health Understanding and Education
EHUE Environment Heater Unit, Electric
E-Hue
Hue is one of the three main attributes of perceived color, in addition to
lightness and chroma (or colorfulness). Hue is also one of the three dimensions
in some colorspaces along with saturation, and brightness (also known as
lightness or value). Hue is that aspect of a color described with names such as
"red", "yellow", etc.
Usually, colors with the same hue are distinguished with adjectives referring to
their lightness and/or saturation, such as with "light blue", "pastel blue",
"vivid blue". Notable exceptions include brown, which is a dark orange, and
pink, a light desaturated red.
In painting color theory, a hue refers to a pure color—one without tint or shade
(added white or black pigment, respectively). A hue is an element of the color
wheel.
Computing hue
In opponent color spaces, such as CIE L*a*b* (CIELAB) and CIE L*u*v* (CIELUV),
hue may be computed together with saturation (or chroma) by converting a color's
chromaticity coordinates from rectangular coordinates into polar coordinates.
Hue is the angular component of the polar representation, while chroma is the
radial component.
Specifically, in CIELAB:
while, analogously, in CIELUV:
In practice, a four-quadrant arctangent may be used if available to invert these
formulae.
Computing hue from RGB
Preucil describes a color hexagon, similar to a trilinear plot described by
Evans, Hanson, and Brewer, which may be used to compute hue. To place red at 0°,
green at 120°, and blue at 240°, one may solve:
He also used a polar plot, which he termed a color circle. Using R, G, and B,
rather than the R, G, and B densities Preucil used, one may compute hue angle
using the following scheme: determine which of the six possible orderings of R,
G, and B prevail, then apply the appropriate formula; see table below.
Ordering Hue Region Formula
Red-Yellow
Yellow-Green
Green-Cyan
Cyan-Blue
Blue-Magenta
Magenta-Red
Note that in each case the formula contains the fraction , where H is the
highest of R, G, and B; L is the lowest, and M is the mid one between the other
two. This is referred to as the Preucil Hue Error, and was used in the
computation of mask strength in photomechanical color reproduction.
Hue angles computed for the Preucil circle agree with the hue angle computed for
the Preucil Hexagon at integer multiples of 30 degrees (red, yellow, green,
cyan, blue, magenta, and the colors mid-way between contiguous pairs), and
differ by approximately 1.2 degrees at odd integer multiples of 15 degrees
(based on the circle formula), the maximum divergence between the two.
Computing hue from RGB for HSB, HSV, and HSL color spaces
Please help improve this article by expanding it.
Further information might be found on the talk page or at requests for
expansion.
This article has been tagged since February 2007.
HSV color space as a conical objectThe process of converting an RGB color into
an HSL color space or HSV color space is usually based on a 6-piece or 12-piece
piecewise-linear mapping, treating the HSV cone as a hexacone, or the HSL double
cone as a double hexacone.
Specialized hues
The hues exhibited by caramel colorings and beers are fairly limited in range.
The Linner hue index is used to quantify the hue of such products.
Hue as a qualification in the names of artist's colors
Manufacturers of pigments use the word hue e.g. 'Cadmium Yellow (hue)' to
indicate that the original pigmentation ingredient, often toxic, has been
replaced by safer (or cheaper) alternatives whilst retaining the hue of the
original. Replacements are often used for chromium, cadmium and alizarin.
Hue vs. dominant wavelength
Dominant wavelength (or sometimes equivalent wavelength) is a physical analog to
the perceptual attribute hue. On a chromaticity diagram, a line is drawn from a
white point through the coordinates of the color in question, until it
intersects the spectral locus. The wavelength at which the line intersects the
spectrum locus is identified as the color's dominant wavelength if the point is
on the same side of the white point as the spectral locus, and as the color's
complementary wavelength if the point is on the opposite side.[
RuneScape is a Java-based
MMORPG operated by Jagex Ltd. With over nine million active free accounts and
more than one million paid member accounts, RuneScape is rated among the most
popular online games in the world. More than five million unique players access
their accounts to play RuneScape at least once per month. RuneScape offers both
free and subscription content and is designed to be accessible from any location
with an Internet connection and to run in an ordinary web browser without
straining system resources. One of the best website that discussed various
gamers' issues is IJFG.com IJFG.COM
Internet Junction For Gamers Internet Junction
For Gamers, Runescape Market and More IJFG.COM This site has Jokes, Pranks, Runescape and other cool games at IJFG.COM. RuneScape is set in a medieval
fantasy world, similar to "Guild Wars" or "EverQuest", where players control
character representations of themselves. As with most massive multiplayer online roleplaying games (MMORPG), there is no overall objective or end to the game.
Players explore, form alliances, perform optional tasks, and complete quests for
rewards and to build character's skills.
Internet Junction For Gamers, Runescape Market and More. IJFG.com IJFG.com
RuneScape takes place in the fantasy-themed realm of Gielinor, which is divided
into several different kingdoms, regions, and areas. Players can travel
throughout the gaming world on foot, by using magical teleportation spells or
devices, or mechanical means of transportation. Each region offers different
types of monsters, materials, and quests to challenge players. Players are shown
on the screen as customisable avatars. They set their own goals and objectives,
deciding which of the available activities to pursue. There is no linear path
that must be followed. Players can engage in combat with other players or with
monsters, complete quests, or increase their experience in any of the available
skills. Players interact with each other through trading, chatting, or playing
combative or cooperative mini-games.
Internet Junction For Gamers, Runescape Market and More IJFG.COM
IJFG.com
Contact Information
Call our office today to set up an appointment. Learn more about how we can
help you, and learn more about the other services that we can offer you. All
messages we receive will be answered as soon as possible. We look forward to
hearing from you.
- Electronic mail
- General Information:
