Kruithof curve: Difference between revisions
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[[Image:Kruithof curve.svg|right|400px|thumb|The Kruithof curve, with two example light sources; [[D65]] (Northern [[daylight]]) and a 3700K [[halogen lamp]], inside the pleasing region.<ref>{{cite journal|url=http://palimpsest.stanford.edu/waac/wn/wn21/wn21-3/wn21-308.html|title=The Color of White: Is there a "preferred" color temperature for the exhibition of works of art?|month=September|year=2000|volume=21|issue=3|first=Steven|last=Weintraub|journal=[[Western Association for Art Conservation]] Newsletter}}</ref>]] |
[[Image:Kruithof curve.svg|right|400px|thumb|The Kruithof curve, with two example light sources; [[D65]] (Northern [[daylight]]) and a 3700K [[halogen lamp]], inside the pleasing region.<ref>{{cite journal|url=http://palimpsest.stanford.edu/waac/wn/wn21/wn21-3/wn21-308.html|title=The Color of White: Is there a "preferred" color temperature for the exhibition of works of art?|month=September|year=2000|volume=21|issue=3|first=Steven|last=Weintraub|journal=[[Western Association for Art Conservation]] Newsletter}}</ref>]] |
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In illumination engineering, the '''Kruithof curve''' relates the [[illuminance]] and [[ |
In illumination engineering, the '''Kruithof curve''' relates the [[illuminance]] and [[colour temperature]] of visually-pleasing light sources. |
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The [[colour]] sensation 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 [[Photoreceptor|rods]] taking over gradually from [[Photoreceptor|cones]] as the brightness of the scene is reduced. This means, for example, that light with a colour temperature of 6000K may appear white under high [[luminance]], but appear bluish under low luminance. Under the same low luminance conditions, the |
The [[colour]] sensation 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 [[Photoreceptor|rods]] taking over gradually from [[Photoreceptor|cones]] as the brightness of the scene is reduced. This means, for example, that light with a colour temperature of 6000K may appear white under high [[luminance]], but appear bluish under low luminance. Under the same low luminance conditions, the colour temperature may need to be adjusted to, say, 4700K, to appear white. This effect leads to a change in [[Color Rendering Index|colour rendition]] with absolute illumination levels that can be summarised in the empirical '''Kruithof curve'''.<ref name=Kruithof1941>{{cite journal |last=Kruithof|first=Arie Andreis|title=Tubular Luminescence Lamps for General Illumination |journal=[[Philips]] Technical Review| volume=6|issue=3|pages=65-96|year=1941|issn=0031-7926}}</ref> |
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==See also== |
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As the brightness of the scene decreases the brightness of red colours decreases more rapidly than those of blue colours, this is the so-called [[Purkinje effect]].{{Fact|date=July 2007}} |
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* [[Purkinje effect]] |
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== References == |
== References == |
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==Further reading== |
==Further reading== |
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* [http://spot.colorado.edu/~davisrg/ Robert G. Davis], Dolores N. Ginthner |
* {{cite journal|author=[http://spot.colorado.edu/~davisrg/ Robert G. Davis], Dolores N. Ginthner|year=1990|title=Correlated color temperature, illuminance level, and the Kruithof curve|journal=Journal of the Illuminating Engineering Society|volume=19|issue=1|pages=27-38}} |
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* {{cite journal|journal=[[Journal of the Optical Society of America A]]|title=Correlated color temperature preferred by observers for illumination of artistic paintings|author=Paulo Daniel Pinto, João Manuel Maciel Linhares, and Sérgio Miguel Cardoso Nascimento|year=2008|month=March|pages=623-630|volume=25|issue=3| url=http://www.arauto.uminho.pt/pessoas/smcn/pdf/PPinto%20josa2008%20early%20posting.pdf|doi=10.1364/JOSAA.25.000623 }} (A study in which the average luminance was 8 cd/m<sup>2</sup>, or the illumination 200–400 lux, with an average of about 330 lux.) |
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== External links == |
== External links == |
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* [http://www.soluxtli.com/edu13.htm Daylight: Is it in the eye of the beholder?] |
* [http://www.soluxtli.com/edu13.htm Daylight: Is it in the eye of the beholder?] by Kevin P. McGuire. |
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[[Category:Color]] |
[[Category:Color]] |
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[[Category:Lighting]] |
[[Category:Lighting]] |
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[[Category:Psychophysics]] |
[[Category:Psychophysics]] |
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{{color-stub}} |
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Revision as of 22:48, 5 May 2008
In illumination engineering, the Kruithof curve relates the illuminance and colour temperature of visually-pleasing light sources.
The colour sensation 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. This means, for example, that light with a colour temperature of 6000K may appear white under high luminance, but appear bluish under low luminance. Under the same low luminance conditions, the colour temperature may need to be adjusted to, say, 4700K, to appear white. This effect leads to a change in colour rendition with absolute illumination levels that can be summarised in the empirical Kruithof curve.[2]
See also
References
- ^ Weintraub, Steven (2000). "The Color of White: Is there a "preferred" color temperature for the exhibition of works of art?". Western Association for Art Conservation Newsletter. 21 (3).
{{cite journal}}: Unknown parameter|month=ignored (help) - ^ Kruithof, Arie Andreis (1941). "Tubular Luminescence Lamps for General Illumination". Philips Technical Review. 6 (3): 65–96. ISSN 0031-7926.
Further reading
- Robert G. Davis, Dolores N. Ginthner (1990). "Correlated color temperature, illuminance level, and the Kruithof curve". Journal of the Illuminating Engineering Society. 19 (1): 27–38.
{{cite journal}}: External link in|author= - Paulo Daniel Pinto, João Manuel Maciel Linhares, and Sérgio Miguel Cardoso Nascimento (2008). "Correlated color temperature preferred by observers for illumination of artistic paintings" (PDF). Journal of the Optical Society of America A. 25 (3): 623–630. doi:10.1364/JOSAA.25.000623.
{{cite journal}}: Unknown parameter|month=ignored (help)CS1 maint: multiple names: authors list (link) (A study in which the average luminance was 8 cd/m2, or the illumination 200–400 lux, with an average of about 330 lux.)
External links
- Daylight: Is it in the eye of the beholder? by Kevin P. McGuire.