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Topic: Dominant wavelength

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In the News (Sun 16 Jun 19)

  Reading on Color and Light, Part III: Composition of Color
The colored light may have a dominant wavelength or hue and the extent to which the hue dominates is known as saturation (or chroma).
This wavelength is referred to as the dominant wavelength and the color associtated with this dominant wavelength is called the hue.
As the dominant wavelength or hue is diluted with white light, the saturation decreases.
acept.la.asu.edu /PiN/rdg/color/composition.shtml   (866 words)

 Dominant wavelength - Wikipedia, the free encyclopedia
For the white point indicated, the dominant wavelength for "x" is on the nearer perimeter, around 600 nm, while the complementary wavelength is opposite, around 485 nm.
In color science, the dominant wavelength and complementary wavelength are ways of describing non-spectral (polychromatic) light mixtures in terms of the spectral (monochromatic) light that evokes an identical perception of hue.
The wavelength of this pure spectral light that will evoke the same color perception as the given complicated light mixture is the dominant wavelength of that mixture.
en.wikipedia.org /wiki/Dominant_wavelength   (818 words)

 LED Forum: Re: Peak wavelength versus dominant wavelength
Dominant wavelength is the single wavelength that is perceived by the human eye, and is defined as the wavelength of monochromatic light that has the same apparent color as the light source.
Simply stated, if the color of a single wavelength ("X" nm) is indistinguishable from the color of a given LED, then that LED has a dominant wavelength of "X".
Peak wavelength is defined as the single wavelength where the radiometric emission spectrum of the light source reaches its maximum.
www.eio.com /public/led/1550.html   (247 words)

 Ophthalmic filter materials - Patent 5973865
Dominant wavelength lines between 580 and 605 nm are indicated at 5 nm intervals.
Wavelengths, in nm, are plotted along the horizontal axis; transmittance values, in %, are plotted along the vertical axis.
Alternatively, the dominant wavelength can be moved by dipping a brown-dyed article briefly in a yellow or a pink dye solution.
www.freepatentsonline.com /5973865.html   (4243 words)

Color perception is very complicated because it not only depends on the various physical properties of light such as the emission and optical properties of the light source, the wavelengths transmitted, etc. but also on things such as surrounding objects, the devices mechanical properties, the viewer’s eye response as well as their psychological state.
The dominant wavelength, specified in nanometers, is obtained from the color coordinates discussed above.
The peak wavelength is the wavelength at the maximum spectral intensity.
ledproductstore.com /colorimetry.htm   (651 words)

 Webvision: Color Perception
The dominant wavelength represents the principle wavelength of the colour.
The complementary wavelength is the wavelength that produces white when mixed in appropriate portions with the dominant wavelength.
The dominant wavelength of A is given by the spectral wavelength at DA and the complementary by the wavelength at CA (figure 11).
webvision.med.utah.edu /KallColor.html   (4599 words)

 LEDs - Gallium Indium Nitride UV, violet, purple, blue, aqua, turquoise, green, white. Also Gallium Arsenide and ...
The light it outputs is a slightly bluish-violet, with a dominant wavelength (where you would point to on a color chart) of approximately 403-405nm.
The light it outputs is a pure, slightly whitish green, with a dominant wavelength (where you would point to on a color chart) of approximately 523-526nm.
The light it outputs is a slightly amberish yellow, with a dominant wavelength (where you would point to on a color chart) of approximately 583-587nm.
ledmuseum.candlepower.us /hebei6.htm   (1592 words)

An intriguing outcome of this study is that the dominant wavelengths are very nearly equivalent to the depths of various seismic discontinuities in the mantle.
Of the eight dominant wavelengths indicated in Figure 4a, six of them are within 5% of the depth of a distinct or suggested discontinuity.
The number of dominant wavelengths that are nearly equivalent to discontinuity depths argues against this correlation being a coincidence.
www.soest.hawaii.edu /wessel/papers/1994/GRL_94/grl_94.html   (2412 words)

 LED types by Color, Brightness, and Chemistry
These are usually either red-orange with a dominant wavelength around 610-617 nm, or yellow or "amber" with a dominant wavelength around 590 nm.
Dominant wavelength can be as low as the 550's of nm ("pure green" or "emerald green", yellowish green but less yellow than usual for LEDs) and as high as the low 630's (He-Ne laser red).
According to Cree the dominant wavelength is 466 nm.
members.misty.com /don/ledc.html   (2909 words)

 JAIC 1997, Volume 36, Number 3, Article 3 (pp. 207 to 230)
wavelengths that are not absorbed pass through the glaze without significant optical scattering, allowing a clear view of the reflective substrate.
Furthermore, the rather sharply delineated transition from low reflectance at the absorbed wavelengths to very high reflectance at the wavelengths that are not strongly absorbed results in a high chroma, the intense color saturation that is the most distinctive appearance attribute of dark glazes that cannot be obtained, for example, with optically scattering tints.
This shift in hue of the PR66 glazes can also be seen in the chromaticity diagram of figure 2, which illustrates the shift in dominant wavelength (under CIE Illuminant C, simulating overcast daylight sky) from 506c (purple) to 630 nm (red) with increased colorant loading.
aic.stanford.edu /jaic/articles/jaic36-03-003_2.html   (739 words)

 Light is electromagnetic energy within a narrow range of frequencies capable of causing the sensation of vision
If more than one wavelength is reflected, the eye/brain performs a mixing of all light energy present and perceives a single color which is a result of the mixture.
Hue is the perceived color of visible light energy, expressed as violet, blue, green, yellow, orange, red, etc. This hue may be a result of a single wavelength of light energy or the dominant wavelength of multiple wavelengths of light energy.
Light of equal energy at all wavelengths appears to the eye/brain as white and is at zero saturation.
www.sencore.com /newsletter/Mar02/ColorArticlepartI.htm   (912 words)

 MESA Spectrum
The sub window graphs wavelength in bars on the horizontal axis against relative amplitude (in negative decibels or a related unit) on the vertical axis, at the current position of the prediction cursor.
Note that the highest point on the line graph does not always correspond to the dominant cycle as shown in the spectrum contour’s green dominant-cycle line and in the standard prediction, due to the smoothing used in calculating the dominant cycle’s wavelength.
Bright colors far away from the dominant cycle line, or high secondary peaks or plateaus in the line graph, correspond to significant cyclic components of multiple wavelengths, which suggests that the dominant cycle may not be dominant for very long, and therefore may not be worth trying to trade on.
www.aspenres.com /Documents/AspenGraphics4.0/MESA_Spectrum.htm   (1197 words)

 Ostwald System
The Ostwald system creates a color space based on dominant wavelength, purity, and luminance, mapping the values of hue, saturation and brightness.
Establishing the values for these parameters is done with a disc colorimeter which mixes on a disk amounts of the pure spectral color at the dominant wavelength with white, and fl.
Thus the point in the Ostwald color space is represented by values C,W, and B to represent the percentages of the circle.
facweb.cs.depaul.edu /sgrais/ostwald_system.htm   (1330 words)

 NRL - Measurement of Ocean Wave Spectra and Surface Slopes by Polarimetric SAR
A wave system with an estimated dominant wavelength of 156 m is propagating through the site with a wave direction of 320°.
The dominant wave, corresponding to a wavelength of 156m, can be determined from this spectrum.
The dominant wave is propagating at a heading of 320°.
www.nrl.navy.mil /content.php?P=04REVIEW186   (622 words)

 [vslist] Results of dominant wavelength/excitation purity help request
The dominant wavelength of the problem colour will be the=20 interpolated value between lambda[i] and lambda[i+1].
To calculate the excitation purity we do the quotient=20 between its distance to the point E and the distance to the origin of=20 the intersection of the line of the angle alphac with the line that=20 joins the points (x[1],y[1]) and (x[n],y[n]).
There is a little trickiness at the wavelength when the=20 dominant wavelength line is just perpendicular.
www.visionscience.com /pipermail/vslist/2004/001093.html   (1402 words)

 NTIA Special Publication 98-35, Radio Astronomy Spectrum Planning Options, Chapter 1
These wavelengths have been measured in the laboratory, and radio astronomers can identify the radiating atoms in a star as hydrogen, helium, carbon, etc., by measuring the wavelengths at which they emit or absorb energy, and comparing these wavelengths with those measured in the laboratory.
Spectral lines (wavelengths of electromagnetic radiation) are known to be affected by the motion of their source, just like the sound of an emergency vehicle’s siren increases or decreases in pitch as it moves toward or away from the observer, respectively.
In the electromagnetic spectrum, long wavelengths correspond to the radio frequency spectrum, intermediate wavelengths to millimeter and infrared radiation, short wavelengths to visible and ultraviolet light, and extremely short wavelengths to x-rays and gamma rays.
www.ntia.doc.gov /osmhome/reports/pub9835/Raspchp1.htm   (3717 words)

The wavelength of the monochromatic stimulus that, when additively mixed with the color stimulus considered, matches the specified achromatic stimulus.
The wavelength of the color corresponding to the perceptual notion of hue.
On the chromaticity diagram, the dominant wavelength is defined as the wavelength of the point on the spectral locus, corresponding to the intersection of the locus with a line drawn from the reference white through the color in question.
www.cs.rit.edu /~ncs/color/glossary.htm   (508 words)

 Chromaticity - Wikipedia, the free encyclopedia
Chromaticity is the quality of a color as determined by its "purity" and dominant wavelength.
Another way to look at this is as the distance of the color from the axis in the L*ab color space.
In the case of a storage ring, a high degree of chromaticity can lead to instabilities in the beam's motion, which will result in large movements of the beam.
en.wikipedia.org /wiki/Chromaticity   (413 words)

 Measuring Dominant Cycle Wave Length
The simple definition of the dominant cycle is the cyclic component identified by MESA that has the greatest amplitude.
The dominant cycle is described by its wavelength, measured in bars.
First, the dominant cycle wavelength is only permitted to change by 25% from bar to bar.
www.aspenres.com /Documents/AspenGraphics4.0/Measuring_Dominant_Cycle_Wave_Length.htm   (349 words)

 Journal of Vision - Constant hue loci across spectral bandwidth, by Mizokami, Werner, Crognale, & Webster
Reference stimuli had a fixed dominant wavelength and a roughly Gaussian spectrum with a bandwidth of 105 nm.
The dominant wavelength of the narrower bandwidth was varied in a 2AFC staircase to match the pair for hue.
Results suggest a weak but incomplete influence of pigment screening at shorter wavelengths, suggesting partial compensation for the filtering effects of the eye.
journalofvision.org /3/12/61   (309 words)

 Opto Diode Corp., Inc.
The wavelength value where half of the light energy is at shorter and half the energy is at longer wavelengths.
The monochromatic wavelength the measurement is done at must be specified as well.
The wavelength shift is typically 0.35nm/C shift in the junction temperature.
www.optodiode.com /app_note_1.htm   (1552 words)

 TIR Dominant Wavelength   (Site not responding. Last check: 2007-10-13)
As the temperature of an object increases, the total amount of radiant energy increases and the radiant energy peak shifts to shorter wavelengths
Relationship between the temperature of a flbody and its dominant wavelength is described by Wien’s Displacement Law: k
?m = ---- where ?m = wavelength of maximum Trad spectral radiant emittance
deathstar.rutgers.edu /courses/airphoto/airphoto9b/sld006.htm   (54 words)

 Photonics.com Printer Friendly Article
Inevitably, one emerges as the dominant wavelength and usurps the gain of the others, which are extinguished.
But the researchers in Singapore harnessed the effect to serve as a sort of photonic Robin Hood, coupling energy from the rich wavelengths into the poor ones so that no one wavelength would become dominant and all could coexist in the same laser.
The investigators demonstrated tuning of the laser wavelengths by tuning the reflectivity of a grating.
www.photonics.com /printerFriendly.aspx?contentID=79977   (739 words)

 1.2.1 Psychophysics   (Site not responding. Last check: 2007-10-13)
(proportion of pure light of dominant wavelength to white light), which corresponds to saturation, and
Note however, that the dominant wavelength is not necessarily that with largest spectral component.
function (the eye's response to light of constant luminance at given wavelength) corresponds to the sum of the curves above (compare this with the energy distribution of sunlight):
www.mat.univie.ac.at /~kriegl/Skripten/CG/node8.html   (348 words)

 EETimes.com - Blue LEDs light disks, bulbs, displays   (Site not responding. Last check: 2007-10-13)
These devices, generally touted as superblue, superbright or high-intensity, generally have a peak emission wavelength of about 430 nm and a so-called "dominant" wavelength of about 470 nm, which is derived from the CIE chromaticity diagram and represents the single wavelength defining the color of the device.
The T1-3/4 lamps in their initial HLMP-CBxx line of untinted, non-diffused devices with a dominant wavelength of 475 nm, feature a minimum output of 250-630 mcd (typical 450 to 1,100 mcd) for viewing angles of 15 degrees to 30 degrees.
At the other end of the viewing scale is the 5-mm LED lamp, the LTL-353UBK, with a peak emission wavelength of 428 nm and a typical luminous intensity of 250 mcd at a viewing angle of 12 degrees.
www.eetimes.com /pw/fo/OEG19990311S0014   (1512 words)

The CIE Chromaticity Diagram can also be used to measure the dominant wavelength and the purity of a given color such as g.
In these cases, the dominant wavelength is specified by finding the dominant wavelength of the complement of j, m, and using its wavelength with a c suffix, 498
This was a surprising finding at the time, because if two musical tones, each of a single wavelength, are played together a chrod is heard (either concordant or discordant depending on their relative pitch).
www.cse.fau.edu /~maria/COURSES/COP4930-GS/colornotes.htm   (4141 words)

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