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Topic: Kruithof curve


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In the News (Wed 24 Apr 19)

  
  The Color of White
According to the Kruithof curve, an observer prefers lower color temperature lighting when the light level is lower, and prefers a higher color temperature when the light level is higher.
According to the Kruithof curve, if the painting is illuminated at the same color temperature under which it was created (for example, 10,000° K), but at a much lower light level (for example, at 20 footcandles), the condition of display would be unpleasant.
Based on the Kruithof curve and experiments in progress, it is probable that the preferred color temperature will shift, based on the intensity of the illumination source.
palimpsest.stanford.edu /waac/wn/wn21/wn21-3/wn21-308.html   (1947 words)

  
 Color   (Site not responding. Last check: 2007-10-28)
The sensitivity curves of the cones are roughly bell-shaped and overlap considerably.
However, the overall luminosity curve (which in fact is a weighted sum of these three curves) is subjective, since it involves asking a test person whether two light sources have the same brightness, even if they are in completely different colors.
The sensitivity curves in the CIE 1931 xyz color space are scaled to have equal areas under the curves.
uncover.us /en/wikipedia/c/co/color.html   (3693 words)

  
 Color - Wikipedia
The sensitivity curves of the cones are roughly bell-shaped and overlap somewhat.
Note that the colour experience of a given light mixture may vary with absolute luminosity, due to the fact that both rods and cones are active at once in the eye, with each having different color curves, and rods taking over gradually from cones as the brightness of the scene is reduced.
This effect leads to a change in color rendition with absolute illumination levels that can be summarised in the "Kruithof curve".
nostalgia.wikipedia.org /wiki/Color   (1387 words)

  
 Kruithof curve - Wikipedia, the free encyclopedia
In color vision, the color experience of a given light mixture may vary with absolute luminosity, because both rods and cones are active at once in the eye, with each having different color curves, and rods taking over gradually from cones as the brightness of the scene is reduced.
This effect leads to a change in color rendition with absolute illumination levels that can be summarised in the Kruithof curve, named after A.
Correlated color temperature, illuminance level, and the Kruithof curve.
en.wikipedia.org /wiki/Kruithof_curve   (134 words)

  
 Kruithof curve   (Site not responding. Last check: 2007-10-28)
In color vision, the color experience of a given light mixture may vary with absolute luminosity, due to the fact that both rods and cones are active atonce in the eye, with each having different color curves, and rods taking over gradually from cones as the brightness of thescene is reduced.
This effect leads to a change in color rendition with absolute illumination levels that can be summarised inthe Kruithof curve, named after A. Kruithof.
Correlated color temperature, illuminance level, and the Kruithof curve.Journal of the Illuminating Engineering Society 19(1):27-38.
www.therfcc.org /kruithof-curve-75763.html   (131 words)

  
 Color   (Site not responding. Last check: 2007-10-28)
The term "red cone" for the long-wavelength cone is deprecated as this cone is actually maximally responsive to green light, albeit longer wavelength green light than that which maximally excites the mid-wavelength/green cone.
The incoming signal spectrum is thus reduced by the eye to three values, sometimes called tristimulus values, representing the intensity of the response of each of the cone types.
Note that the color experience of a given light mixture may vary with absolute luminosity, because both rods and cones are active at once in the eye, with each having different color curves, and rods taking over gradually from cones as the brightness of the scene is reduced.
hallencyclopedia.com /Color   (4560 words)

  
 Read about Color at WorldVillage Encyclopedia. Research Color and learn about Color here!   (Site not responding. Last check: 2007-10-28)
The term "red cones" for the long-wavelength cones is deprecated as this type is actually maximally responsive to light we perceive as greenish, albeit longer wavelength light than that which maximally excites the mid-wavelength/"green" cones.
The sensitivity curves in the CIE 1931 and 1964 xyz color space are scaled to have equal areas under the curves.
Because the CIE sensitivity curves have equal areas under the curves, light with a flat energy spectrum corresponds to the point (x,y) = (0.333,0.333).
encyclopedia.worldvillage.com /s/b/Colour   (5363 words)

  
 Curve - Xah: Special Plane Curves: Naming and Classification of Curves   (Site not responding. Last check: 2007-10-28)
A Bezier curve in its most common form is a simple cubic equation that can be used in The B├ęzier curve slider demo (requires Shockwave for Director 5).
Curves you've heard of and curves you haven't, from Astroid to the Witch of Agnesi.
The Peano-Gosper curve is a plane-filling curve originally called a "flowsnake" by The Gosper island bounds the space that the Peano-Gosper curve fills.
pheromone.allinfosites.com /q/pheromone-curve.htm   (629 words)

  
 Curve, - Curve - You don't have to be a size 2 to be a perfect 10
Curve, - Curve - You don't have to be a size 2 to be a perfect 10
Focus is a curve fitting software for the Windows operating system that has been developed to facilitate spectroscopic modelling and data exchange.
Curve Ball Modified type game of classic old school pong hit the ball with your paddle but make it curve to win.
www.hispider.com /?q=curve   (683 words)

  
 colour   (Site not responding. Last check: 2007-10-28)
However, the overall luminosity curve (which in fact is a weighted sum of these three curves) is subjective, since it involves asking a test person whether two light sources have the same brightness, even if they are in completely different colours.
The sensitivity curves in the CIE 1931 xyz colour space are scaled to have equal areas under the curves.
Note that the colour experience of a given light mixture may vary with absolute luminosity, because both rods and cones are active at once in the eye, with each having different colour curves, and rods taking over gradually from cones as the brightness of the scene is reduced.
www.mcfly.org /colour   (4059 words)

  
 Colorimetry   (Site not responding. Last check: 2007-10-28)
Color can be measured using a spectrophotometer, which takes measurements in the visible region (and a little more on both ends,) to generate a spectral reflectance curve of a given color sample.
The spectral reflectance curve is the most accurate data that can be provided regarding a colors characteristics.
However, a spectral refelectance curve is a graph of 31 readings taken at 10 nanometer increments along the electromagnetic spectrum from 400 to 700 nanometers.
read-and-go.hopto.org /Color/Colorimetry.html   (466 words)

  
 colo information   (Site not responding. Last check: 2007-10-28)
However, the overall luminosity curve(which in fact is a weighted sum of these three curves) is subjective, since it involves asking a test person whether two lightsources have the same brightness, even if they are in completely different colors.
The sensitivity curves in the CIE 1931 xyz color space arescaled to have equal areas under the curves.
Note that the color experience of a given light mixture may vary with absolute luminosity, because both rods and cones areactive at once in the eye, with each having different color curves, and rods taking over gradually from cones as the brightnessof the scene is reduced.
www.vsearchmedia.com /colo.html   (3610 words)

  
 oclo information,colo   (Site not responding. Last check: 2007-10-28)
However, the overall luminosity curve(which in fact is a weighted sum of these three curves) is subjective, since it involves asking a test person whether two lightsources have the same brightness, even if they are in completely different oclors.
The sensitivity curves in the CIE 1931 xyz oclor space arescaled to have equal areas under the curves.
Different cultures have different terms for oclors, and may also assign some oclor names to slightly different parts of the spectrum, or have a different oclor ontology: for instance, the Japanese oclor aoi can be interpreted as meaning something between the Westernoclor terms of "blue" and "green": green is regarded as a shade of aoi.
www.vsearchmedia.com /oclo.html   (3617 words)

  
 Curve - J Curve Records - Jazz, Blues, Latin and Roots Music for the   (Site not responding. Last check: 2007-10-28)
Curve - J Curve Records - Jazz, Blues, Latin and Roots Music for the
The resulting pitch should drop and curve to the left.
The current record is an example of elliptic curve with rank = 24, The highest rank of an elliptic curve which is known exactly (not only a lower bound
love-in-it.com /l/curve.html   (223 words)

  
 For alternate meanings see color disambiguation color disambiguation ...
In practice, the human color receptors will be saturated or even be damaged at extremely-high light intensities, but such behavior is not part of the CIE color space and neither is the changing color perception at low light levels (see: Kruithof curve Kruithof curve).
This effect of color perception was utilised by Vincent van Gogh Vincent van Gogh, a Post-Impressionist Post-Impressionist painter.
This effect leads to a change in color rendition with absolute illumination levels that can be summarised in the "Kruithof curve Kruithof curve".
www.biodatabase.de /color   (3280 words)

  
 Color [Definition]   (Site not responding. Last check: 2007-10-28)
There are about 6 million in the human eye, concentrated at the fovea and gradually becoming sparser towards the outside of the retina.
Cones are less sensitive than the rod cells in the retina (which support vision at low light levels), but allow the perception of color because there are [normally] three kinds of cones, with different photopsins, which have different response curves (that is, they respond to varia...
It is typically expressed in the SI unit watts or in terms of solar luminosities, Ls; that is, how many times more energy the object radiates than the Sun....
www.wikimirror.com /Color   (8397 words)

  
 Daylight: Is it in the eye of the beholder?
Kruithof provided the lighting designer with a breakthrough concept that has
Further refinements of the Kruithof Curve is currently being made by
While the Kruithof curve characterizes a physiological condition that
www.soluxtli.com /edu13.htm   (1418 words)

  
 Blanco’s ‘sin tax’ dubbed hypocritical - Bossier Press-Tribune Online
Bossier Parish School Board Superintendent Ken Kruithof recently spoke out against Gov.
Twenty long years of being behind the curve in education.
Although Superintendent Ken Kruithof says he agrees that educators deserve a salary increase, he disagrees with her plan to do so.
www.bossierpress.com /index.php?option=com_content&task=view&id=840&Itemid=1   (1140 words)

  
 Use of Microsphere Immunoassay for Simplified Multianalyte Screening of Thyrotropin and Thyroxine in Dried Blood Spots ...   (Site not responding. Last check: 2007-10-28)
Linear regression for TSH yielded a curve with a slope of 5.6887
Calibration curves for the simultaneous determination of TSH and T
All concentrations are given in volumes of whole blood.
intl.clinchem.org /cgi/content/full/49/2/335   (862 words)

  
 Color - Gurupedia   (Site not responding. Last check: 2007-10-28)
If we take the Fourier transform of v and plot its absolute value, we obtain whan is called the
This effect of color perception was utilised by Vincent van Gogh, a
Different cultures have different terms for colors, and may also assign some
www.gurupedia.com /c/co/color.htm   (3732 words)

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