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	Metamerism (color)
		When two color samples appear to match under a particular light source, and then do not match under a different light source this is "sample metamerism." One can conclude that the spectral reflectance distributions of the 2 samples differ slightly, and their plotted reflectance curves cross in at least 2 regions.
		Example: most people have experienced sample metamerism when putting on two socks that appeared to be fl while in the bedroom (which may have incandescent lights), but later finding that one is fl and the other is blue upon stepping into the kitchen (which may have fluorescent lights).
		Illuminant metamerism is witnessed when you have a number of spectrally matched (exactly the same) samples, but when each is independantly, yet simultaneously illuminated and viewed under lights whose spectral power distributions differ.
	pedia.newsfilter.co.uk /wikipedia/m/me/metamerism__color_.html (652 words)

	Encyclopedia: Metamerism (color)
		Metamerism is a psychophysical phenomenon commonly defined incompletely as "two samples which match when illuminated by a particular light source and then do not match when illuminated by a different light source."
		Example: most people experience sample metamerism when putting on a pair of socks that appeared to be fl in the bedroom (which may have incandescent lights), but later finding that one is fl and the other is blue upon stepping into the kitchen (which may have fluorescent lights).
		Illuminant metamerism is witnessed when you have a number of spectrally matched (exactly the same) samples, but when each is independently, yet simultaneously illuminated and viewed under lights whose spectral power distributions differ, you can perceive significant variations of the color.
	www.nationmaster.com /encyclopedia/Metamerism-(color) (578 words)

	metamerism has ruined the inkjet experience for many novices who were not adequatelly warned.
		It is noteworthy that most complaints on metamerism are with some of the Epson desktop printers such as the 2000p and especially the Epson 7500.
		Metamerism used to mean the effect when a color looks different depending on whether it is viewed under tungsten lighting or out in natural sunlight.
		Nice thing is that metamerism is not hazardous to your health, aside from pain and suffering combined with mental anguish.
	www.fineartgicleeprinters.org /metamerismEpsoninkjetprinters/greenish_metamerismproblems.htm (1110 words)

	Datacolor - Understand color measurement and color matching from the Experts (Site not responding. Last check: 2007-10-08)
		Metamerism is a potentially important consideration in any color control application involving the color matching of two objects.
		Even if object metamerism is unavoidable, it may be possible to develop a good commercial match by selecting a production formula resulting in an acceptably low level of illuminant metamerism.
		Nimeroff Index of Metamerism - the square root of the sum of the squares of the differences between the spectral curves of a pair of objects.
	www.datacolor.com /color_experts_006.shtml (963 words)

	ISOMERISM - LoveToKnow Article on ISOMERISM (Site not responding. Last check: 2007-10-08)
		Especially prominent is the fact that polymerism and metamerism are mainly reserved to the domain of organic chemistry, or the chemistry of carbon, both being discovered there; and, more especially, the phenomenon of metamerism in organic chemistry has largely developed our notions concerning the structure of matter.
		The constitution of these inorganic isomers is still somewhat questionable; and in addition it seems that polymerism, metamerism and stereoisomerism play a part here, but the general feature is that cobalt and platinum act in them with high valency, probably exceeding four.
		The second prediction is the possibility of metamerism, and the number of metamers, in a given case among compounds, which are realizable.
	www.1911encyclopedia.org /I/IS/ISOMERISM.htm (3820 words)

	A Note on Color Inconstancy
		Metamerism, on the other hand, is the change in color difference between a pair of samples.
		Metamerism can only be controlled by using the similar colorants in the color standard and the sample.
		Metamerism, on the other hand, depends on the type of colorants used and the luminant pair.
	www.techexchange.com /thelibrary/colorinc.html (913 words)

	Poster on Metamers (Site not responding. Last check: 2007-10-08)
		In their ordinary life humans are hardly concerned for metamerism and intuitively take the specimens identical in color for identical in general.
		So, the main problem of the experiments, after the metameric specimens were painted, was to overcome this "intuition" in experimenters themselves.
		When looking at our metameric paints one can hardly suppose that it is ever possible to remember the difference between the specimens to recognize them by color.
	www.iitp.ru /projects/posters/meta (2018 words)

	Metamerism
		Metamerism is the phenomenon whereby surfaces which, though their underlying physical properties are different, are perceived by an observer (for example, the human visual system or a colour camera) to be the same colour.
		It is this process of sampling the input signal that is at the heart of metamerism, for it can happen, that signals which when represented by continuous functions of wavelength are quite different can, after the sampling process, give rise to the same triplet of RGB responses.
		The Metamer Set theory deepens our understanding of metamerism and it also turns out to be a powerful entity which aids in the study of both metamerism, and other problems in colour science.
	www.sys.uea.ac.uk /Research/groups/compvis/Metamerism/Metamerism.htm (3111 words)

	What is Metamerism? (Site not responding. Last check: 2007-10-08)
		Metamerism is a psychophysical phenomenon commonly defined incorrectly as "two samples which match when illuminated by a particular light source and then do not match when illuminated by a different light source."
		Sample metamerism: When two color samples appear to match under a particular light source, and then do not match under a different light source this is "sample metamerism." One can conclude that the spectral reflectance distributions of the 2 samples differ slightly, and their plotted reflectance curves cross in at least 2 regions.
		Illuminant metamerism: Illuminant metamerism is witnessed when you have a number of spectrally matched (exactly the same) samples, but when each is independently, yet simultaneously illuminated and viewed under lights whose spectral power distributions differ.
	www.wisegeek.com /what-is-metamerism.htm (683 words)

	Evaluation of camera performance
		Metamerism can be used to evaluate the camera’s ability to handle small colour difference measurements (Paper I).
		A colour pair is defined as similar if its value for the general metameric index is in the range of 0-5, or for the CIE Lab difference formula in the range of 0-3.
		For the further study, the effects of metamerism due to illumination are investigated and therefore only the CIE Lab formula is utilized.
	herkules.oulu.fi /isbn9514267885/html/i1030636.html (814 words)

	Mal's Colour pages - metamerism index
		He can with some justification say, that for him, the degree of metamerism on that pair which match in daylight is 5 JND in tungsten light.
		Nevertheless an index of metamerism such as this is gaining in importance due to the rapid spread of colour measurement and colour prediction.
		The success in practice of the 'metamerism index' is due to the work that has been done in attempting to define mathematically this change in sensitivity as shown in the following section.
	www.mal.reid.btinternet.co.uk /colour/colourbook/metamerism.htm (315 words)

	Controlling Metamerism on the Epson Stylus Photo 2000P
		Metamerism is an effect created when objects having different spectral distributions look alike under one light source but appear different when viewed with a dissimilar light source.
		Metamerism is most frequently seen when two colored objects match in daylight, but differ markedly in color when viewed in tungsten-filament light.
		This arises because the visible absorption spectra of the two objects differ significantly, although the tristimulus values in daylight are identical (the colors have the same set of color coordinates but different spectral reflec tance curves).
	www.inkjetart.com /2000p/metamerism.html (1533 words)

	Luminous landscape
		In other words metamerism may be caused by the Light Cyan or Light Magenta inks used by the 2000p and other printers which use Epson's archival inkset.
		Metamerism is an optical phenomenon which causes certain colors to look different under various light conditions.
		The print may also have a correct color balance in the evening — when the windows are closed and all light is artificial — and a green tint in the daytime — when the lights are off and all light comes from the open sky and the sun.
	www.luminous-landscape.com /reviews/printers/epson_c80.shtml (2760 words)

	Talk:Metamerism - Wikipedia, the free encyclopedia
		A layman can recognize color metamerism when two colored objects that match under one illuminant fail to match under an other illuminant.
		Color metamerism is present when two colored objects having the same color appearance nevertheless have different spectral curves.--No, 2 lights with different spectral poser distributions are actually metameric, in which case the sample is not in question as being metameric or not.
		If two colored samples have identical spectral curves or reflectance spectra then they cannot be metamerism.
	www.wikipedia.org /wiki/Talk:Metamerism (304 words)

	Metamers
		The fundamental reason for metamerism is that color is perceptual rather than a property of an object.
		As you might guess, you can run across problems with metameric pairs in all sorts of situations – a set of furniture with fabric from different dye lots, wall paper produced in different runs, paint mixed to match a color from a different brand of paint, and so on.
		More important, metamerism is something you need to keep very much in mind when dealing with color on a computer system.
	www.fibitz.com /metamers/metamers.html (3083 words)

	Scanner Profiling - Step by Step
		Metamerism is defined as a shift in color when viewing the same subject under different types of light sources.
		Fluorescent and incandescent lights are examples of light sources that often bring out metamerism due to their poor coverage of the light spectrum.
		Fortunately, there are ways to compensate for metamerism caused by the scanner light source and differing media.
	www.ddisoftware.com /prism/help/steps.htm (5174 words)

	The evolution of metamerism (Site not responding. Last check: 2007-10-08)
		A second advantage of metamerism is that it lessens the impact of injury.
		A third advantage of metamerism is that it permits the modification of certain regions of the body for specialized functions, such as feeding, locomotion, and reproduction.
		Recent cladistic analyses suggest that the phylum is not a monophyletic grouping and that polychaetes arose from metameric ancestor independently of the oligochaetes and leeches.
	okolis.pmfst.hr /courses/zoology/Zoo_24.htm (1227 words)

	Mal's Colour pages - metamerism
		Metamerism results when two objects have different spectral reflectance curves but the same colour coordinates for at least one illuminant.
		Illuminant metamerism results when two objects, which match under one set of conditions, no longer match when the illuminant is changed.
		Geometric metamerism results when two objects, which match under one set of conditions, no longer match when the geometry of illumination, or viewing, or both is changed.
	www.mal.reid.btinternet.co.uk /colour/colourbook/definitionofmetamerism.htm (285 words)

	Metamerism_(color) (Site not responding. Last check: 2007-10-08)
		This article is about metamerism as it relates to colour theory.
		Illuminant metamerism is witnessed when you have a number of spectrally matched (exactly the same) samples, but when each is independently, yet simultaneously illuminated and viewed under lights whose spectral power distributions differ.
		Without the phenomenon of metamerism, mass art reproductions in color would not be possible and the color printing industry, as we know it, could not exist.
	www.apawn.com /search.php?title=Metamerism_(color) (478 words)

	Epson Gray Balancer without target?
		Metamerism isn't a color; it's a SHIFT in color depending on light source.
		The yellow ink is supposed to be the main cause of metamerism on the 2200.
		Everybody and his brother is complaining about the metamerism problem with the 2200 so I would expect to see lots of hits of web pages raving about this as a solution, if in fact, it was so great.
	www.photo.net /bboard/q-and-a-fetch-msg?msg_id=004SMd (1358 words)

	creativepro.com - Epson Stylus Pro on a (24-inch) Roll
		With the 7500, metamerism and somewhat muddy shadow areas may be issues for the fine-art market.
		Metamerism mostly comes into play with images that have a lot of neutral tones, and it is the main reason why fl-and-white images do not reproduce well on the Stylus Pro 7500 or Stylus Photo 2000P.
		Epson claims that the metamerism found in the Stylus Pro 7500 and 2000P is related to the droplet size in those printers, and that metamerism has been eliminated entirely with the forthcoming successor to the Stylus Pro 5000 -- the 5500.
	www.creativepro.com /story/review/12072.html (1091 words)

	answer03
		Metamerism is a situation of serially repeated body parts or metameres making up the body of an organism.
		Metamerism has a definite influence on the life style and shape of a typical polychaete such as a clam worm (genus Nereis).
		Overall, therefore, metamerism has a definite effect on the shape and lifestyle of the clamworm.
	www.biologie.uni-hamburg.de /b-online/library/crone/3050/answer03.html (694 words)

	Metamerism (Site not responding. Last check: 2007-10-08)
		For example, one may experience color metamerism in putting on two socks that appear to be fl while in the bedroom (which may have incandescent lights), but finding that one is fl and the other is blue upon stepping into the kitchen (which may have fluorescent lights).
		Incandescent light bulbs contain relatively little light in shorter (blue) wavelengths, and thus it would be more difficult to distinguish blue colors in such lighting conditions.
		Metamerism may seem like a bad thing; however, metamerism is important in the graphic arts reproduction industry.
	www.explainthis.info /me/metamerism.html (515 words)

	Metamerism Problems (Troubleshooting Guide)
		Metamerism problems involve the matching of paper's appearance to a color standard, particularly when one has to make sure that the paper will look the same under different types of illuminant.
		To avoid the occurrence of metamerism problems, the best approach is to use reflectance curve data corresponding to the visible range of light wavelengths.
		In white grades one can get a preliminary idea about whether whitening effects are highly variable by illuminating samples of paper with an ultraviolet light or by comparing brightness or color measurements in the presence and in the absence of a UV cut-off filter in the incident beam of light.
	www4.ncsu.edu /~hubbe/TShoot/G_Metam.htm (514 words)

	Pacific Northwest Color Management Users Group
		Metamerism, however, is specifically defined as a phenomenon that occurs between two samples.
		Metamerism, remember is when an object matches another under a certain illuminant even though the spectral characteristics of the two objects differ.
		Perhaps a match-failure problem should be called metamerism "failure" rather than metamerism, but this term does not seem to be used at all.
	www.spiritone.com /~pnwcmug/pages/ccnews5.html (2658 words)

	Metamerism free ink/paper combination for epson 2200/2100
		Free of metamerism is abit of a goal.
		So I'm convinced that metamerism seems to be a an inherent problem of printing with CMYK colors.
		The only way to reduce this problem seems to be the usage of either a RIP, creating your own custom ICC profiles or as in the case of BW pictures the usage of dedicated fl and grey inks.
	www.photo.net /bboard/q-and-a-fetch-msg?msg_id=008Dqp (1538 words)

	Metamerism in the Matching of Colors (Site not responding. Last check: 2007-10-08)
		You know you have an instance of metamerism if two paper sheets look identical under one set of lighting conditions, but they appear to have a different shade from each other under a different illuminant.
		The major causes of metamerism problems are (a) poor selection of dyes when the same grade is made on different paper machines, (b) different effective levels of fluorescent whitening agents, especially in white grades, and (c) attempting to make the same grade with very different types of fiber furnish.
		Metamerism in color paper grades usually can be avoided by making sure that the red, yellow, and blue dyes each have a similar hue to the dye used when making the standard that was approved by the customer.
	www4.ncsu.edu:8030 /unity/users/h/hubbe/www/Defnitns/Metamrsm.htm (184 words)

	[No title]
		D65 or A. Furthermore, the degree of metamerism may still be quite considerate even the same type of daylight source is concerned.
		To quantify the degree of metamerism caused by daylight sources with different makes and characters, the CIE firstly recommended the an evaluating method in its Publication No. 51 to quantify the degree of metamerism caused by daylight sources with different makes and characters..
		For all the testing D65 and D50 sourcessimulators, the visual metamerism index (MIvis) based on the CIE methods were compared with the ratings from the visual results.
	www.iscc.org /aic2001/abstracts/oral/Xu_Luo.doc (499 words)

	Color Matters -True Color and Metamerism
		Metamerism is a phenomenon that occurs when colors change when viewed in different light sources.
		In the case of the carpet, the flooring was displayed in a showroom lit by warm incandescent lighting and installed in an office with cool fluorescent lighting.
		In this situation, metamerism is a more complicated phenomenon that occurs when colored objects match in one light source but not in another.
	www.colormatters.com /des_meta.html (1018 words)

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