Lab-color-space - Factbites

Lab-color-space - Factbites
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Topic: Lab-color-space

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	Lab color space - Wikipedia, the free encyclopedia
		CIE 1976 Lab* is based directly on the CIE 1931 XYZ color space as an attempt to linearize the perceptibility of color differences, using the color difference metric described by the MacAdam ellipse.
		To convert between RGB and Lab for example, it is necessary to determine or assume an absolute color space for the RGB data, such as sRGB or Adobe RGB.
		The Lab color model has been created to serve as a device independent, absolute model to be used as a reference.
	en.wikipedia.org /wiki/Lab_color_space (648 words)

	Proposal for a Standard Color Space for the Internet
		Color management is a term that describes a technology that translates the colors of an object (images, graphics or text) from their current color space to the color space of the output devices like monitors, printers, ….
		Since the image is in a known color space and the profile for that color space would ship with the OS and browser, this enables the end users to enjoy the benefits of color management without the overhead of larger files.
		If no color space is indicated by the author, the User Agent (UA) should interpret this as "no color correction" and continue to render as it does now.
	www.citycat.ru /doc/Graphics/sRGB/w3color.html (3724 words)

	FAQ
		The system is the same as the CIELab color space, except that it describes the location of a color in space by use of polar coordinates rather than rectangular coordinates.L* is a measure of the lightness of a sample, ranging from 0 (black) to 100 (white).
		For CIELab and CIELCh color spaces, each point is plotted on a two-dimensional graph with a* on the x axis and b* on the y axis.
		Color space is an arrangement of colors in some orderly fashion.
	www.prism.to /glossary.htm (1771 words)

	color-space.faq.txt
		A color gamut is the boundary of the color space.
		A device dependent color space is a color space where the color produced depends on the equipment and the set-up used to produce it.
		Some device dependent color spaces have their position within CIE space defined These are known as device callibrated color spaces and are a kind of half way house between dependent and independent color spaces.
	www.aim-dtp.net /aim/technology/color-spaces_faq/color-space.faq.txt (7939 words)

	Color Space
		A color is said to be "out of gamut" when its position in one device's color space cannot be directly translated into another device's color space.
		COLOR SPACE represents all the possible colors that can be produced by a particular output device, such as a monitor, color printer, photographic film or printing press.
		The.gif image format uses indexed color space; as such,.gif images cannot be anti-aliased unless they are first converted to RGB.
	www.beezlebugbit.com /school/color/colorspace.htm (1013 words)

	CGSD Gamma Correction and Color Space
		The colors were made in Adobe Photoshop in Lab color space and converted to RGB space using the gamma mentioned.
		An image in Lab space (Photoshop calls this Lab Mode) should not be affected by gamma.
		An image in RGB space should become lighter as you raise the gamma setting and darker as you decrease the gamma setting.
	www.cgsd.com /papers/gamma_colorspace.html (354 words)

	Anhang1.html
		Color printing is based on the CMYK color space.
		With ImageServer the color spaces of single images may be changed during layout generation and during printing.
		A-2 and A-3 illustrate the effect of a device independent color space (Please note that you may as well have a RGB device on the output side, e.g.
	www.helios.de /support/manuals/IS-e/is-html/Output/Anhang1.html (709 words)

	Lab Color model and painting - GFXartist.com - Served over 20,000,000 artworks
		Lab does have a wider color gammut than the other color spaces (RGB, CMYK), so I guess that is why it exists...
		The disadvantage is that lab has lots of colors outside cmyk gamut, and also outside rgb so if you like very bright colors and you pick them from lab mode you might use colors both screen and cmyk can't display.
		I sometimes use the lab color section of photoshop's big color circle, exactly for the reason you said, that it's easy to make a color a bit greener/redder or bluer/yellower than messing with cmyk values.
	www.gfxartist.com /community/forum/44253 (623 words)

	AIM: What is Wrong with the CIE Lab Specification
		The evaluations are overlaid on a quite typical photograph, this is because the aim of this evaluation is to assess the usefulness of the Lab color-space and the dE* as a color-difference measure for photographic imaging purposes.
		The problem with the CIE Lab is that it is nowhere near perceptually uniform color space.
		L1, a1 and b1 are the Lab values of color 1 and L2, a2 and b2 are the Lab values of color 2.
	www.aim-dtp.net /aim/evaluation/cie_lab (1030 words)

	MacDermid ColorSpan Inc. - High resolution large format and wide format inkjet color printers.
		Lab is a theoretical color model that describes color in three planes: L, a, and b.
		Below is a graphic of the Lab color model:
		This color model is consequently considered a 'device-independent' color model, and does not carry with it the inherent gamut limitations of monitors or printers.
	www.colorspan.com /support/tutorials/cmpl/lab.asp (169 words)

	Determining the best Color Space for compression
		For example in a color space in which the interchannel cross correlation is high, information will be coded redundantly and and this will lead to lower compression ratios.
		Now that we know in each color space which are the components that we can subsample without increasing too dramatically the distortion we need to compare the four color spaces.
		Different examples of sampling in the YCbCr Color space
	www.stanford.edu /~esetton/experiments2.htm (568 words)

	Lab - TheBestLinks.com - Labrador Retriever, Laboratory, Lab color space, Disambig, ...
		Lab is used to refer to the Lab color space; Lab is simplified from the formal name Lab*.
		Lab - TheBestLinks.com - Labrador Retriever, Laboratory, Lab color space, Disambig,...
		Lab, Labrador Retriever, Laboratory, Lab color space, Disambig, Lactid acid...
	www.thebestlinks.com /Lab.html (147 words)

	Color Spaces, Device Characterization, and Color Management in Photoshop 7
		Using the Lab color space, you can potentially be working with all the colors the eye can see; however, the eye can actually see more colors than most of the cameras and printers we work with can reproduce.
		The color gamut of the human eye is described in a color space called Lab color.
		When you are working on a project using the Lab color space, you won't be throwing out colors that the eye can see and you won't be working with any colors that the eye cannot see.
	www.informit.com /articles/article.asp?p=30296&seqNum=2 (1327 words)

	Aleksandra Mojsilovic: Color Quantization
		Color quantization is sampling of three dimensional color spaces (such as RGB or Lab), which results in a discrete subset of colors known as a color codebook or palette.
		Color spaces (such as RGB or Lab) are, on the other hand, three-dimensional.
		The proposed color quantization, i.e., color space sampling and numbering of sampled points, makes the methods for processing gray-scale mages extendible to color images.
	www.research.ibm.com /people/a/aleksand/sunflower.html (304 words)

	RetouchPRO - sRGB color space for Challenges
		Color spaces describe to the computer how colors are displayed and how many are represented.
		A color space is a specific implementation of a color model.
		sRGB and Adobe RGB are color spaces for the RGB (additive) color process, CMYK is a color process (subtractive).
	www.retouchpro.com /forums/showthread.php?p=72322 (654 words)

	Omni Spec - Spectroscopy, Spectral Instrumentation, Spectral Software, CCD Cameras
		Color sequence is also a time sequence set of procedures for the continuous monitoring and display of color space and color differences, in choice of color space CIE Yxy, Lab, or LCh or color differences E* or H*.
		Full Color space calculations allow the user to make discrete color space calculations of CIE Yxy, Lab, and LCh, and in color difference calculations of E* or H*.
		These procedures include a variety of mathematical calculations plus many specialized procedures including thin film thickness measurements and color space (CIE) calculations.
	members.tripod.com /~omnispec/cspecwin.html (525 words)

	Color Management for Photographers #006 @Digital Outback Photo
		Perceptual is going to be the better choice when a large portion of colors from the source space are going to get clipped, as more compression is required to “fit” all of the colors in the target space and still maintain smooth tonal gradations.
		RC is best when only a small portion of colors from the source space will get clipped as the slight compression to the out-of-gamut colors is acceptable and the main body of colors is kept relatively intact.
		The downside is that every image would have a different color space.
	www.outbackphoto.com /color_management/cm_06/essay.html (1714 words)

	What is CIE 1976 (L* a* b) colour space*?
		These notes are principally concerned with the latter known as CIE 1976 (L* a* b) colour space* or CIELAB.
		In fact in 1976 the CIE specified two colour spaces; one of these was intended for use with self-luminous colours and the other was intended for use with surface colours.
		The need for a uniform colour space led to a number of non-linear transformations of the CIE 1931 XYZ space and finally resulted in the specification of one of these transformations as the CIE 1976 (L* a* b) colour space*.
	www.colourware.co.uk /cpfaq/q3-21.htm (312 words)

	creativepro.com - Inside Photoshop: The Color Lab
		Unlike RGB colors that are screen-dependent and CMYK colors that vary with printer, ink and paper characteristics, CIE Lab colors are device-independent.
		In Photoshop, the Lab mode consists of three color channels, as shown in Figure A. The first channel is Lightness (L).
		Lab colors are convenient and fun to work with.
	www.creativepro.com /story/feature/12869.html (1293 words)

	Design Features: Desktop Color, Part One
		I tell Photoshop the color space I want to work in (srgb, ColorMatch rgb Adobe rgb or lab) and Photoshop uses the ICC profile for my monitor to adjust the display of my master art files so I see them correctly on that monitor within that chosen color space.
		The default color space in Photoshop 5 and 5.5 is srgb, but that may not be the best space for your work.
		The actual color gradients you see here probably don’t accurately display the actual colors in the space, but it gives you an idea of the trade offs.
	www.commarts.com /CA/feadesign_d/color4x/01_colorx.html (719 words)

	YCC color space
		The YCC space can also be converted easily, but with some mathematical loss, to the monitor color space, which can be called explant RGB (red, green, blue), and once converted to RGB subsequently converted to the four colors needed for printing - cyan, magenta, yellow and black.
		YCC color space can be converted to any of several other color spaces with some reshaping of the mathematical values.
		Broadcast television developed an encoding technique called YIQ which is comprised of a black-and-white signal (Y) and two color, or chroma (I and Q) channels that describe the mathematical color coordinates of the color in the image.
	www.aols.com /colorite/yccspace.html (430 words)

	Lab - Wikipedia, the free encyclopedia
		Lab color space, the most complete color model used conventionally to describe all the colors visible to the human eye
		Lab is a common shortened form for several terms and can refer to:
		Labrador, a region on the easternmost coast of Canada
	en.wikipedia.org /wiki/Lab (202 words)

	YARC's Color Tutorial
		This was an attempt by Color Scientists to quantify each individual's perception of color into a standard mathematical reference frame (the CIE Color Space).
		It is barely a Science, for the color coordinate system we use today, called the 'CIE color space', is based on a 1931 notion of 'a hypothetical Standard Observer'.
		By adjusting the proportions in which they mix we can obtain a 'gamut' of colors, Note that a typical 'gamut' is not a 'spectrum' of colors, as some of the colors in the spectrum cannot be printed with typical printer's inks.
	www.yarc.com /colortut.htm (1970 words)

	Quicklook2
		The color coherence vector in Lab color space, quantized into 64 colors, where pixels are coherent if they belong to a large similarly colored region; the image is first blurred by averaging a
		The moments of inertia (mean, variance, skewness, kurtosis) of the color distribution in Lab space.
		The cooccurrence of colors in Lab color space, quantized into 11 colors: red, orange, yellow, green, blue, purple, pink, brown, black, gray, white.
	www.aa-lab.cs.uu.nl /cbirsurvey/cbir-survey/node35.html (453 words)

	Color Space Conversions
		" message is perfectly OK. It means that for a particular color space the color's current coordinates cannot be represented as valid RGB numbers.
		The wire-frame RGB cube is shown now in the YIQ space (thus, deformed).
		The colored hexagon on the left is a horizontal slice of the hexcone, shown on the right as a light-grey plane.
	www.cs.rit.edu /%7Encs/color/a_spaces.html (412 words)

	Graphic Design Terms: Graphic Design Dictionary
		Examples of color spaces include: RGB, CMYK, HSB, CIE LAB.
		Color space is a particular way to describe color.
		It is also the set of colors available to be applied to images.
	www.graphicdesigndictionary.com /c.html (515 words)

	Sharpening 101
		If you are minding every last little bit of color change, be aware that changing color space introduces rounding errors in color values (and the error is more severe in 8-bit images than in 16-bit images).
		If you aren’t using color profiles for all of your equipment and attempting to maintain color matching between acquisition and print, sharpening using only the luminosity data is probably overkill, though, as any miscalibration between your monitor and printer likely produces a bigger shift.
		The reason for using a technique like this is that sharpening colored edges means that the Unsharp Mask uses the color data to determine how to modify the edge.
	www.bythom.com /sharpening.htm (3263 words)

	The (future) benefits of LAB color space
		In this futuristic scenario, the LAB color image is untouched during all these operations, while the color space is temporarily transformed into the more restrictive color gamuts of proofing and color printing.
		Setting as a goal nondestructive color space conversion, LAB color would be a good starting point for the color managed work that might be done in the future.
		Printing presses with seven units, color separation utilities that convert easily from LAB color (or any other space) and the budgets to produce such exotic printing are all limited at present.
	www.aols.com /colorite/labspace.html (281 words)

	efg's Chromaticity Diagrams Lab Report
		Showing the gamut correctly for various color spaces is usually not possible on a single display monitor since the gamuts are slightly different and some of the colors cannot be accurately represented.
		Visual color matching is far from being that precise." But with all this precision, and with a computer, the chromaticity coordinates can be computed directly from the color matching functions instead of using the separate tabulations as in the past.
		The 1-nm tabulations of the CIE color matching functions are given to seven significant figures.
	www.efg2.com /Lab/Graphics/Colors/Chromaticity.htm (2161 words)

	Imaging On-Line Store
		Assuming that the input to a bilevel color printer is given in CIE-XYZ tristimulus values or CIE-LAB values instead of the more conventional RGB or YMC values, two modified versions based on vector operation in (1) the XYZ color space and (2) the LAB color space were tested.
		Experimental results show that the modified methods, especially the method using the LAB color space, resulted in better color reproduction performance than the conventional methods.
		Taking colorimetric color reproduction into account, the conventional error diffusion method is modified for color digital halftoning.
	www.imaging.org /store/epub.cfm?abstrid=1814 (166 words)

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Topic: Lab-color-space

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