Kruithof curve: Difference between revisions
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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 [[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''', named after [[A. A. Kruithof]].<ref name=Kruithof1941>{{cite journal |author=Kruithof, A.A. |title=Tubular Luminescence Lamps for General Illumination |journal=Philips Technical Review| volume=6|issue=3|pages=65-96|year=1941}}</ref> |
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 colour rendition with absolute illumination levels that can be summarised in the empirical '''Kruithof curve''', named after [[A. A. Kruithof]].<ref name=Kruithof1941>{{cite journal |author=Kruithof, A.A. |title=Tubular Luminescence Lamps for General Illumination |journal=Philips Technical Review| volume=6|issue=3|pages=65-96|year=1941}}</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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Revision as of 01:00, 30 April 2008
In illumination engineering, the Kruithof curve relates the illuminance and color 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, named after A. A. Kruithof.[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, A.A. (1941). "Tubular Luminescence Lamps for General Illumination". Philips Technical Review. 6 (3): 65–96.
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.
External links
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