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Topic: Spectral color

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	Color
		In a rainbow or the separation of colors by a prism we see the continuous range of spectral colors (the visible spectrum).
		This works well for spectral colors but it is found that many different combinations of light wavelengths can produce the same perception of color.
		The inherently distinguishable characteristics of color are hue, saturation, and brightness.
	hyperphysics.phy-astr.gsu.edu /hbase/vision/specol.html (361 words)

	Color - MSN Encarta
		Color, physical phenomenon of light or visual perception associated with the various wavelengths in the visible portion of the electromagnetic spectrum (see Electromagnetic Radiation; Spectrum).
		The color of light of a single wavelength or of a small band of wavelengths is known as a pure spectral color or hue.
		An example of the mixing of subtractive primaries is in color photography and in the printing of colored pictures in magazines, where magenta, yellow, fl, and cyan inks are used successively to create natural color.
	encarta.msn.com /encnet/refpages/RefArticle.aspx?refid=761577547 (1019 words)

	Spectral color - Wikipedia, the free encyclopedia
		A spectral color is a color that is evoked by the optical spectrum; every wavelength of light yields a different spectral color, in a continuous spectrum.
		In the CIE xy chromaticity diagram, the spectral colors are the horseshoe shape curve on the outside.
		All other colors are not spectral: the bottom straight line is the line of purples, while the interior are unsaturated colors: a mixture of a spectral color and a grayscale color.
	en.wikipedia.org /wiki/Spectral_color (349 words)

	Color
		The theory of colors, in particular, has suffered much, and its progress has been incalculably retarded by having been mixed up with optics generally, a science which cannot dispense with mathematics; whereas the theory of colors, in strictness, may be investigated quite independently of optics.
		Color as a visual response should not be confused with the "color" of a pigment, which is the color one would see when viewing that pigment under typical lighting conditions.
		Color reproduction schemes rely on the fact that any color visible by humans can be approximated by the combination of a limited subset of visible light frequencies.
	hypertextbook.com /physics/waves/color/index.shtml (2616 words)

	Design Notes: Color
		Color is said to be three dimensional because of it's three aspects: hue value and saturation.
		The farther from the center a color is, the brighter it is. Note that each hue is brightest at it's natural value: yellow is lightest and blue and violet the darkest.
		The color interaction is diagramed using a color wheel with red, green and blue as primary colors.
	daphne.palomar.edu /design/color.html (1974 words)

	Spectral Light as Sculptural Space
		Spectral intensity variations of light have not been used as a means of creating sculptures whose spatial existence depends on the different wavelengths of color.
		Spectral color has not been used as a means of achieving interpenetration of space in sculpture, that is, a simultaneous perception of different spatial locations without the optical destruction of the common overlapping part.
		Spectral patterns are optically superimposed resulting in interpenetration of planes that simultaneously recede and advance in a new type of planar space articulation of light volumes.
	www.mi.sanu.ac.yu /vismath/russ/index.html (3610 words)

	Color Glossary
		Basic color term A color word (a) that is monolexemic (unlike "reddish-yellow"); (b) whose extension is not included in that of any other color term (unlike "scarlet", whose extension is included in "red"); (c) whose application is not restricted to a narrow class of objects (unlike "roan"); and (d) that is psychologically salient (unlike "puce").
		Color constancy Stability in the perceived color of a surface across changes in illumination and the consequent changes in the light reaching the eye.
		Color temperature The temperature of the perfect fl body radiator whose chromaticity is closest to that of the light under consideration.
	tigger.uic.edu /~hilbert/Glossary.html (5536 words)

	R-3: COLOR
		It may also be considered as subtractive color, since what the eye sees is the result of the pigment subtracting (absorbing) from white light all wavelengths except those reflected.
		color wheel becomes a useful tool for studying the relationships of these 12 colors and their combinations in floral arranging.
		Fortunately, the amount of green foliage present may be minimized without detracting from the overall color design, and (depending on season) there are many floral, foliage, and container possibilities in hues from yellow-green through the warm colors to red.
	www.hort.vt.edu /faculty/McDaniel/hort2164/R3Color.htm (3834 words)

	Color - Wikipedia, the free encyclopedia
		Color (or colour, see spelling differences) is the visual perceptual property corresponding in humans to the categories called red, yellow, white, etc. Color derives from the spectrum of light (distribution of light energy versus wavelength) interacting in the eye with the spectral sensitivities of the light receptors.
		To summarize, the color of an object is a complex result of its surface properties, its transmission properties, and its emission properties, all of which factors contribute to the mix of wavelengths in the light leaving the surface of the object.
		Note that the colors depicted depend on the color space of the device on which you are viewing the image, and therefore may not be a strictly accurate representation of the color at a particular position, and especially not for monochromatic colors.
	en.wikipedia.org /wiki/Color (4170 words)

	Glossary of Color Terms (Site not responding. Last check: 2007-10-10)
		(color); (4) of paper, reflectance of an infinitely thick specimen (reflectivity) measured for blue light with a centroid wavelength of 457 nm under specified spectral and geometric conditions of measurement.
		In color measurement, a sample is measured over a white background, then over a fl background and the ratio expressed either as a perctentage (where 100% = complete opacity) or as a ratio to 1.
		The color of the resulting mixture is lighter and less saturated than the color without the addition of the white.
	www.color-tec.com /1gloss.htm (6776 words)

	Color Matters - The Amazing Science of Color
		Infra-red is a non-visible "color" that exists outside of the visible colors of the electro-magnetic spectrum.
		One of these people is a color scientist, John J. Stapleton, Pte., who is unweaving the rainbow and presenting new theories about the "how and why" of color and color vision.
		These are the "true" physical colors representing the different energy density generated by the cells - not pseudo colors arbitrarily assigned to the areas, such as the color coding used in traditional x-ray machines today.
	www.colormatters.com /sci_frontier.html (1145 words)

	Spectral Color vs Temperature (Site not responding. Last check: 2007-10-10)
		Conversely, there is a range of temperatures at which a body emits a significant amount radiation at a particular color (wavelength).
		As the object is heated to a higher temperature this distribution of light wavelengths changes decreasing in the average wavelength, but still a continuous distribution of wavelengths.
		What your eyes perceive is that the "color" becomes more orange then yellow then bluer, and finally it becomes "white hot" when the temperature is so high that all wavelengths in the visible range 400 to about 700 nanometers have about equal intensity.
	www.newton.dep.anl.gov /askasci/phy00/phy00468.htm (472 words)

	handprint : the geometry of color
		One consequence was that 18th century color research focused on various kinds of subjective color experience, in particular the appearance of complementary hues induced by a strong color stimulus that can be observed in afterimages, simultaneous color contrasts and complementary shadow contrasts.
		For surface colors, where the lightness of a colored tile must be matched to a gray tile under the same illumination, the HK effect seems somewhat smaller than for lights and is more equal around the hue circle; it is also dependent on the chromaticity of the light source.
		Hue is indicated by (1) colored circles for spectral hues at 10 nm intervals as defined by the CIE 10° observer (wavelength indicated in italics); (2) fl dots for average hue angles of target colors the Munsell Color Order System; and (3) colored dots for the approximate location of the four unique hues.
	www.handprint.com /HP/WCL/color2.html (15909 words)

	AutoVision - Precision Spectral & Color Measurement for Manufacturing Automation and Applied Remote Sensing
		AutoVision is making hyperspectral remote sensing systems and spectral imaging components available to a new generation of users and applications with unbeatable performance and cost efficiency.
		Precision color and spectral imaging reveal the real colors of your product and materials.
		AutoVision is committed to high performance hyperspectral remote sensing instruments and spectral imaging systems for color management and factory automation - contact us to learn more on how our unique imaging approaches can help in your applications.
	www.autovision.net (129 words)

	efg's Color Reference Library -- General Color Info
		Kurt Nassau, The Physics and Chemistry of Color: The Fifteen Causes of Color, John Wiley, 1983.
		In a sense brown is a physiological color.
		In the well-known book "Color Science," by Gunter Wyszecki and W.S. Stiles (2nd ed, Wiley, 1982) there are some spectral reflectance curves of human skin for a number of races.
	www.efg2.com /Lab/Library/Color/index.html (1304 words)

	Spectral Selectivity
		Spectral selectivity is a technique for creating images which uses intentionally limited ranges of radiation in the ultraviolet, visible or infrared portions of the spectrum.
		Early day photographers often needed to work around the inherent spectral sensitivity limitations of the photographic materials available to them.
		Colored filters are the primary tool for selective use of spectrum with conventional photography.
	www.photo.net /photo/edscott/spectsel.htm (500 words)

	Spectral color of ecological time series
		We used simulation models to explore the effects of various within-population processes on the spectral color of the simulated time series of abundances.
		Results show that reddened spectral color could be explained as the effect of a combination of measurement error and natural variability (in the form of white environmental noise).
		Thus, it may not be necessary to invoke complex varieties of environmental noise to explain the observed spectral exponents; the typical value of +1 may be caused by white environmental noise affecting a population that is observed with measurement error.
	www.ramas.com /spectral.htm (304 words)

	Color Research
		Color, color imaging, color image analysis, and color vision research, funded by University of Joensuu and Academy of Finland
		Regional and national projects with industry, funded by industry and National Technology Agency of Finland (TEKES), managed by
		This database consists of ten color spectra sets, measured from many different kinds of coloured samples.
	spectral.joensuu.fi (75 words)

	www.multispectral.org
		The multispectral.org is a forum of scientific cooperation between everybody working in the field of spectral color science.
		To distribute information on spectral color science such as reports, publications, conference presentations, projects.
		Multi-spectral Image Acquisition and Spectral Reconstruction using a Trichromatic Digital Camera System associated with absorption filters
	spectral.joensuu.fi /multispectral (132 words)

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