- Metamerism
Metamerism has at least three meanings Metamerism biology is the property of having repeated segments, as in annelids a concern of zoology and developmental biology The chemical property of having the same proportion of atomic components in different arrangements obsolete, replaced with isomer Metamerism color , relates to two colors and their relation under different light sources. It also defines the capability of humans to recognise different colours and their relation under different light colours sun, bulb, neon,... disambig de Metamerie nl Metamerie pl Metameria ru fi Metameria sv Metamerism ... more details
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- Metamerism (color)
dablink This article is about metamerism as it relates to colorimetry . For other meanings see the metamerism disambiguation page. In colorimetry , metamerism is the matching of apparent color of objects with different spectral power distribution s. Colors that match this way are called metamers . A spectral power distribution describes the proportion of total light emitted, transmitted, or reflected by a color sample at every visible wavelength it precisely defines the light from any physical stimulus. However, the human eye contains only three color receptors cone cell s , which means that all colors are reduced to three sensory quantities, called the tristimulus value s. Metamerism occurs because each type of cone responds to the cumulative energy from a broad range of wavelengths, so that different combinations of light across all wavelengths can produce an equivalent receptor response and the same tristimulus values or color sensation. Sources of metamerism Metameric matches are quite common, especially in near neutral grayed or whitish colors or dark colors. As colors become lighter ... imaging, is the ability to make metameric color matches. Making metamerism matches using ... of metamerism . The sensitivity of a metameric match to any changes in the spectral elements that form the colors depend on the degree of metamerism. Two stimuli with a high degree of metamerism ..., field of view, etc. The word metamerism is often incorrectly used to indicate a metameric failure .... Measuring metamerism The best known measure of metamerism is the Color Rendering Index , which ... Metamerism Index ref http www.cie.co.at publ abst 15 2004.html CIE Publication 15 ref which is derived ... 0.65 C 0.5 1.0 0.65 1.3 D 1.0 2.0 1.3 2.6 E 2.0 2.6 Metamerism and industry Using materials that are metameric ... characteristic, making them a good metameric match with a low degree of metamerism, and thereby reducing ... Wesley Longman, 1998. External links Commons cat Metamerism color http www.cs.brown.edu exploratories ... more details
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- Metamerism (biology)
. See also wiktionary metamerism Metamerism for other meanings Segmentation biology Segmentation Phytomer ... more details
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- Gray card
File Graukarte.svg thumb 18 Gray card File Manweissabgleich.jpg thumb Image before left and after right adjustment with gray card middle A gray card is a middle gray reference, typically used together with a reflective light meter , as a way to produce consistent image exposure photography exposure and or color in film and photography . A gray card is a flat object of a neutral gray color that derives from a flat reflectance spectrum. A typical example is the Kodak R 27 set, which contains two 8x10 cards and one 4x5 card which have 18 reflectance across the visible spectrum, and a white reverse side which has 90 reflectance. Note that flat spectral reflectance is a stronger condition than simply appearing neutral this flatness ensures that the card appears neutral under any illuminant see Metamerism color metamerism . Application A major use of gray cards is to provide a standard reference object for exposure determination in photography. A gray card is an approximate realisation of a Lambertian scatterer its apparent brightness and exposure determination therefore does not depend on its orientation relative to the light source. By placing a gray card in the scene to be photographed, oriented at a defined angle relative to the direction of the incident light, and taking a reading from it with a reflected light meter, the photographer can be assured of consistent exposures across their photographs. This technique is similar to using an incident meter, as it depends on the illuminance but not the reflectivity of the subject. In addition to providing a means for measuring exposure, a gray card provides a convenient reference for white balance, or color balance , allowing the camera to compensate for the illuminant color in a scene. Gray cards can be used for in camera white balance or post processing white balance. Many digital camera s have a custom white balance feature. A photo of the gray card is taken and used to set white balace for a sequence of photos. For post ... more details
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- Tristimulus colorimeter
pages 540 558 ref reducing metamerism color Metameric failure observer metamerism color errors , if the product ... more details
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- Illuminant D65
sources, only simulators. The quality of a simulator can be assessed with the CIE Metamerism color Metamerism Index. ref cite book author CIE Technical Report year 1999 isbn 92 9034 051 7 title A Method ... range metamerism index and is used as a measure of the quality of the test illuminant ... in terms of an ultraviolet range metamerism index, defined as the average of the colorimetric differences ... more details
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- Optical phenomenon
luminescence or photoluminescence . Phosphorescence Mie theory Why clouds are white Metamerism color Metamerism as of alexandrite Moire Newton s rings Pleochroism gems or crystal s which seem many ... more details
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- Index of optical articles
glass material science optical properties Metamerism color metamerism Michelson Morley experiment ... more details
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- Notostraca
united, as seen in other groups of Branchiopoda. ref name Ax The metamerism of the trunk of Notostraca ... organs on their ventral side are subject to multiplication the metamerism of the ventral nerve chain and the ventral muscles agrees with the metamerism of the limbs, and not with that of the cuticle ... more details
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- Anus
skeleton which enables worm like animals to burrow metamerism , in which the body was built ... more details
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- Standard illuminant
, Vienna Nevertheless, they do provide a measure, called the Metamerism Index , to assess the quality ... is taken as the visible range metamerism index and is used as a measure of the quality of the test ... assessed in terms of an ultraviolet range metamerism index, defined as the average of the colorimetric ... iso catalogue catalogue tc catalogue detail.htm?csnumber 41694 ISO Standard 23603 2005 E . ref The Metamerism color Metamerism Index tests how well five sets of metameric samples match under the test ... more details
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- Dye-sublimation printer
Optical density density levels and virtually no metamerism color metamerism or bronzing. Citation ... more details
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- Standard Reference Method
. Because of Metamerism color metamerism one cannot, in the general case of non zero deviation ... more details
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- Siboglinidae
, papillae, and ciliary tracts. Posterior to the trunk is the short metamerism metamerically segmented ... more details
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- Meta
Metamathematics Metamechanics Metamedia Metameme Metamerism Metamodeling Metanarrative Metanational ... more details
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- Charles Otis Whitman
1899 The metamerism of clepsine 1912 The Behavior of Pigeons posthumous, 1919 References cite book ... more details
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- PenTile matrix family
four color primaries instead of the conventional three, using subpixel rendering combined with metamerism ... more details
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- Kanae It?
theme song, Metamerism . For The World God Only Knows she performed in the ending theme song ... more details
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- Nautilus
nine teeth. There are two pairs of gill s. These are the only remnants of the ancestral Metamerism biology metamerism to be visible in extant cephalopods. ref name Wingstrand1985 cite journal url http ... more details
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- Lab color space
histinfo Technical date November 2010 Image Lab color space.png thumb right The CIE 1976 L , a , b color space CIELAB , showing only colors that fit within the sRGB color space sRGB gamut and can therefore be displayed on a typical computer display . Each axis of each square ranges from 128 to 128. A Lab color space is a opponent process color opponent space with dimension L for lightness color lightness and a and b for the color opponent dimensions, based on nonlinearly compressed CIE XYZ color space coordinates. The coordinates of the Hunter 1948 L , a , b color space are L , a , and b . ref name Hunter1948a cite journal title Photoelectric Color Difference Meter first Richard Sewall last Hunter journal JOSA volume 38 issue 7 pages 661 year 1948 month July url http www.opticsinfobase.org abstract.cfm?URI josa 38 7 651 Proceedings of the Winter Meeting of the Optical Society of America ref ref name Hunter1948b cite journal title Accuracy, Precision, and Stability of New Photo electric Color Difference Meter first Richard Sewall last Hunter journal JOSA volume 38 issue 12 pages 1094 year 1948 month December url http www.opticsinfobase.org abstract.cfm?URI josa 38 12 1092 Proceedings of the Thirty Third Annual Meeting of the Optical Society of America ref However, Lab is now more often used as an informal abbreviation for the CIE 1976 L , a , b color space also called CIELAB, whose coordinates are actually L , a , and b . Thus the initials Lab by themselves are somewhat ambiguous. The color spaces are related in purpose, but differ in implementation. Both spaces are derived from the master space CIE 1931 color space CIE 1931 XYZ color space , which can predict which spectral power distribution s will be perceived as the same color see Metamerism color metamerism , but which is not particularly perceptual uniformity perceptually uniform . ref http www.brucelindbloom.com UPLab.html A discussion and proposed improvement , Bruce Lindbloom ref Strongly influenced by the M ... more details
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- Tetrachromacy
Image BirdVisualPigmentSensitivity.svg thumb The four pigments in a bird s Cone cell cones extend the range of color vision into the ultraviolet . ref name hart Figure data, uncorrected absorbance curve fits, from Hart NS, Partridge JC, Bennett ATD and Cuthill IC 2000 Visual pigments, cone oil droplets and ocular media in four species of estrildid finch. Journal of Comparative Physiology A186 7 8 681 694. ref Tetrachromacy is the condition of possessing four independent channels for conveying color information, or possessing four different types of cone cell s in the eye . Organisms with tetrachromacy are called tetrachromats. In tetrachromatic organisms, the sensory color space is four dimensional, meaning that to match the sensory effect of arbitrarily chosen spectra of light within their visible spectrum requires mixtures of at least four different primary color s. Description The normal explanation of tetrachromacy is that the organism s retina contains four types of higher intensity light receptors called cone cell s in vertebrates as opposed to rod cell s which are lower intensity light receptors with different absorption spectrum absorption spectra . This means the animal may see wavelength s beyond those of a typical human being s eyesight, and may be able to distinguish color s that to a human appear to be Metamerism colour identical . Animals that are tetrachromats The zebrafish Danio rerio is an example of a tetrachromat, containing cone cells sensitive for red, green, blue, and ultraviolet light. ref cite journal doi 10.1073 pnas.90.13.6009 last1 Robinson first1 J. last2 Schmitt first2 E.A. last3 Harosi first3 F.I. last4 Reece first4 R.J. last5 Dowling first5 J.E. year 1993 title Zebrafish ultraviolet visual pigment absorption spectrum, sequence, and localization url journal Proc. Natl. Acad. Sci. U.S.A. volume 90 issue 13 pages 6009 6012 pmid 8327475 pmc 46856 ref The mantis shrimp Gonodactylus smithii sees at least four basic colors. ref cite journal l ... more details
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- Orthrozanclus
which may indicate that the animal was metamerism biology metameric , in other words built out of repeated ... more details
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- Shinryaku! Ika Musume
theme is nihongo Metamerism Metamerizumu by Kanae It . A second anime season has been ... more details
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- Tryblidiida
metamerism indeed, with living Monoplacophora to study, it can be seen that their body segments exhibit ... more details
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- Color temperature
temperature Effective temperature Whiteness Metamerism color Metamerism and industry Color metamerism ... more details
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