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Topic: Contrast ratio

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	SED Panel Contrast Ratio Boosted to 100,000:1 -- Tech-On!
		At the Display 2005 event held in Tokyo on April 20, 2005, SED (Surface-conduction Electron-emitter Display) Inc., a joint venture formed by Canon Inc. and Toshiba Corp., unveiled a SED panel with full On/Off contrast ratio boosted to approximately 100,000:1.
		The key factor behind the sharp rise in contrast ratio is a broad reduction in fl luminance.
		All editorial content and graphics on this Web site may not be reproduced in whole or in part without the express permission of the copyright owner.
	techon.nikkeibp.co.jp /english/NEWS_EN/20050421/104026 (460 words)

	Video Displays and Home Theater Projectors: The Contrast Ratio Number Game
		Contrast is the ratio between the white and fl parts in an image.
		ANSI Contrast represents a more fair way to test contrast ratio as the presence of fl and white at the same time is closer to the real world environment rather than the all fl or all white image used during the full ON/OFF contrast measurement.
		Therefore, opt for a high contrast projector or display (typically 2000:1), only as long as you can view the image in a light controlled room; you need to view the image in a completely darkened room to be able to perceive the marginal difference between a 2000:1 and a 500:1 contrast ratio.
	www.practical-home-theater-guide.com /contrast-ratio.html (2272 words)

	Contrast ratio - Wikipedia, the free encyclopedia
		The contrast ratio is a metric of a display system, defined as the ratio of the luminosity of the brightest and the darkest color the system is capable of producing.
		With such a room, the contrast ratio of the image would be the same as the device.
		Contrast ratio is most commonly considered in connection with displays that share the same light emitter for all pixels and employ an array of modulators for individual pixels, which manipulate their transmissivity or reflectivity.
	en.wikipedia.org /wiki/Contrast_ratio (1170 words)

	Introduction--Monitor Technology Guide (Site not responding. Last check: 2007-10-31)
		Contrast ratio, most often talked about with LCD monitors, is the measure of the difference of brightness levels between the brightest white and the darkest fl.
		Additionally, as a more clear indication of overall monitor performance, contrast ratio should also be evaluated in conjunction with brightness, viewing angles and response time since all specifications are inter-related.
		HDTV has a 16:9 aspect ratio, but for computer displays, a 16:10 aspect ratio is optimal for rectangular displays because it allows for two full pages of text to be shown side-by-side on one screen.
	www.necdisplay.com /support/css/monitortechguide/index05.htm (1020 words)

	Weber and contrast ratios
		Contrast ratio refers to the ratio of intensities between the most intense (brightest) and least intense (darkest) elements of a scene, an image, or a display.
		A ratio of 30:1 is typical of viewing television in a living room.
		The minimum intensity is defined by the contrast ratio, CR; its intensity is 1 divided by CR.
	www.poynton.com /notes/Timo/Weber_and_contrast_ratio.html (503 words)

	Feature Article
		Contrast Ratio (CR) is basically a ratio between any two brightness levels, but the CR that we are most interested in is the ratio of brightness between 0%stim and 100%stim.
		For instance, the ANSI CR is the ratio between the averages (or sums) of eight 100%stim boxes in a 4x4 checkerboard and the averages (or sums) of eight 0%stim boxes in that same checkerboard.
		Contrast ratio doesn't have to be a ratio between white and fl, it can be between two other levels (like white and one level above fl), but it is most common for it to be used for the ratio of luminance between white and fl for display devices.
	www.hometheaterhifi.com /volume_13_2/feature-article-contrast-ratio-5-2006-part-1.html (2136 words)

	FunkyFoof - Buying an LCD Flat Panel TV
		Contrast ratio is a key feature that is often overlooked or misunderstood during the purchase process.
		Simply put, contrast ratio is the measure of a monitor's flest fl compared to its whitest white.
		In practical terms, the higher the contrast ratio, the better the television's ability to discern fine, detailed differences between dark and light colors.
	www.funkyfoof.com /Guides/lcdtv1.htm (523 words)

	Contrast Ratio (Site not responding. Last check: 2007-10-31)
		Contrast Ratio is a measurement of the difference in brightness between the whitest white and the darkest fl within an image.
		A ratio of 300:1 means the brightest point in the image is 300 times as bright as the darkest point.
		A higher contrast ratio therefore means a larger difference in brightness.
	www.mediacollege.com /lighting/contrast-ratio (91 words)

	Contrast Ratio, What is Contrast Ratio: by ChooseYourTv.com
		Contrast Ratio is the difference between the whitest white and the darkest fl colors that the display can show.
		Contrast ratio is often used when describing TVs.
		A high contrast ratio, such as 4000:1, signifies a better color representation (bright images will appear better against a darker background) than a lower contrast ratio, such as 2500:1.
	chooseyourtv.com /contrast.html (205 words)

	X-bit labs - Print version
		The contrast ratio has grown since the 172S: it’s twice higher, although the maximum brightness is even higher than in the previous model.
		The contrast ratio is good: the level of fl is 0.5nit at the minimum brightness.
		The contrast ratio is a little lower than of the 172V, but higher than of the 172S.
	www.xbitlabs.com /articles/other/print/response-6.html (8590 words)

	Slashdot \| Sharp LCD Display with 1,000,000:1 Contrast Ratio
		Contrast ratio, brightness, and screen-performance information are generated by suing highly tailored test patterns and performance benchmarks that have little to do with the real image, but a lot to do with published specs.
		It is theoretically possible to have a contrast ratio of cd:1 where the projector has a ratio* of c:1 and the LCD has a ratio of d:1.
		It is the ratio of the brightness of the white pixel to the brightness of the fl pixel.
	rss.slashdot.org /Slashdot/slashdot?m=938 (3873 words)

	Fujitsu General America, Inc.
		Contrast ratio, while important, tells just part of the story.
		Contrast ratio (CR) is defined as the difference of luminance energy measured from the brightest white and then compared to the luminance energy measured from the darkest fl of a particular device or a particular environment.
		For example, if the white area is 1000 candelas and the fl area is 1 candela, the screen is said to boast a 1000:1 contrast ratio.
	www.plasmavision.com /contrast_ratio.htm (588 words)

	"Brightness" and "Contrast" controls
		Contrast ratio is the ratio of luminance between the brightest white that can be produced and the darkest fl that can be produced.
		Contrast ratio is a major determinant of perceived picture quality: If a picture has high contrast ratio, you will judge it to be sharper than a picture with lower contrast ratio, even if the lower contrast picture has substantially more measurable resolution.
		Second, a number of phenomena act to scatter light onto the face of the screen, and the higher the brightness of bright areas of the picture, the more light is scattered into the dark areas.
	www.poynton.com /notes/brightness_and_contrast (1525 words)

	X-bit labs - Print version
		The level of contrast is controlled rather simply: the x signal from the graphics card doesn’t go directly to the matrix, but is first multiplied by the coefficient C. Thus, it is clear that white color that corresponds to the maximum angle of the crystals is only reached at the maximum contrast setting.
		Second, the contrast ratio is measured in the center of the screen, while the user sees the sides of the screen at a different angle than the center.
		Their contrast ratio may be considered as such, but Well, when this technology was being promoted into the market — when a contrast ratio of 300:1 was considered an achievement for an LCD monitor — high contrast ratio was touted as an advantage of MVA matrices.
	www.xbitlabs.com /articles/other/print/lcd-guide.html (12628 words)

	Measuring Contrast of a Liquid Crystal Display (Site not responding. Last check: 2007-10-31)
		The luminance contrast C may be defined as as the ratio of the difference between character and background luminance DL, to the luminance of the character.
		C = 1 - 1 / CR In the case of direct drive LCD's, when the applied voltage is sufficient to fully activate the segment, the highest contrast ratio is obtained.
		The contrast ratio is sometimes measured at V
	www.liquidcrystaltechnologies.com /ContrastRatio.htm (406 words)

	Contrast Ratio in Cameras
		In video and film work it is important to understand what sort of contrast ratio your camera is able to reproduce.
		A high contrast ratio means that brighter and darker areas of the image will be recorded with more accuracy and apparent detail.
		The best way to minimize problems with contrast ratio is to avoid having very bright and very dark objects in frame at the same time.
	www.mediacollege.com /lighting/contrast-ratio/camera.html (294 words)

	GameSpot Forums - General Hardware Discussion - What is contrast ratio?And what is a good contrast ratio for a LCD HDTV?
		So the higher the contrast ratio, the closer it is to being a true fl, as well as the images within them, will appear.
		I have a Samsung 32" and the contrast Ratio is 4000:1 which is really good for a TV that size.
		Contrast ratio determine the color quility of LCD'S. Contrast is measured using the fl-to-white scale.
	www.gamespot.com /pages/forums/show_msgs.php?topic_id=25033378 (1072 words)

	Maxforums - The PERFECT contrast ratio is 511:1 - so when specs show 500:1, is it really 511:1 rounded off?
		now this ratio is assuming that your using the maximal brightness value, since you can have a smaller brightness value, such as 1/4th the maximum value, which would transform a contrast ratio of 511:1 into a (127.75):(.25).
		another words, when you see a contrast ratio of 500:1 on a spec sheet of a monitor (LCD), is it really a contrast ratio of 511:1, since 500 is the closest number to 511, as opposed to 450 or 550.
		Contrast is the ratio between fl and white.
	www.maxforums.org /thread.aspx?tid=319681 (772 words)

	Projectisle.com.au - Projector Guide to Contrast Ratio
		is ratio between white and fl of the image on your screen.
		Essentially, the higher contrast on a projector increases the perception of depth in the image, and means subtle colour variations show up more clearly.
		The ongoing war between LCD and DLP was all going DLP's way until the Sony VLP-HS50 and the Panasonic PT-AE700, both use dynamically reconfiguring variable aperture (iris), that adjusts to the brightness level of the image on a frame by frame basis.
	www.projectisle.com.au /projector-guide-contrastratio.asp (355 words)

	Juicy Studio: Luminosity Contrast Ratio Algorithm
		I've created a Luminosity Contrast Ratio Analyser (Beta) to allow colour combinations to be tested against the suggested luminosity contrast ratio algorithm.
		From the example luminosity contrast ratios, it's clear that the results yielded by the suggested algorithm are sensible.
		The contrast of the colours that pass may not be as clear as they could be, but this is catered for by the fact that the yielded ratios pass at level 2 rather than level 3.
	juicystudio.com /article/luminositycontrastratioalgorithm.php (1352 words)

	Sharp Claims Highest-Contrast LCD - Hardware News by InformationWeek
		Sharp Corp. has developed an LCD panel that exhibits a contrast ratio of 1,000,000 to 1 the company will aim at the professional monitor market.
		The contrast ratio of 1,000,000 to 1 will provide enough margin for image creation," said Shigeaki Mizushima, corporate director and group general manager of Sharp's AVC Liquid Crystal Display Group.
		Presently, professional use monitor displays are all CRT based and deliver a contrast ratio ranging from 10,000 to 1 to 100,000 to 1.
	informationweek.com /hardware/personaltech/171202733?cid=rssfeed_pl_ptp (419 words)

	Tools - Colour Contrast Analyser 1.1 - WAT-C [Web Accessibility Tools Consortium]
		The Gamma correction and RGB constants are derived from the Standard Default Color Space for the Internet (sRGB), and the 0.05 offset is included to compensate for contrast ratios that occur when a value is at or near zero, and for ambient light effects.
		Text or diagrams and their background must have a luminosity contrast ratio of at least 5:1 for level 2 conformance to guideline 1.4, and text or diagrams and their background must have a luminosity contrast ratio of at least 10:1 for level 3 conformance to guideline 1.4.
		Note: The method of determining the colour value transformations for the 3 types of colour deficiency is from an algorithm described by Hans Brettel, Francoise Vienot and John Mollon in a paper which appeared in the Journal of the Optical Society of America V14, #10 pp2647.
	www.wat-c.org /tools/CCA/1.1/index.html (1582 words)

	HDTV World - CNET.com
		Four full-range channels of programming and data can be compressed into the same space required by a single analog channel.
		contrast ratio - Difference between the brightest whites and the darkest fls a display can show.
		The higher the contrast ratio, the greater the ability to show subtle color details and tolerate ambient room light (for example).
	www.cnet.com /4520-7874_1-5107912-4.html (624 words)

	High Contrast HDTVs with Luscious Color
		For televisions, contrast ratio is the literally the luminance ratio of peak brightness (white) to video fl.
		For example, a contrast ratio of 1000:1 indicates that a TV is capable of producing a peak white level that is 1000 times as bright as when it displays its darkest fl.
		By itself, a contrast ratio spec provides no indication as to how bright (or dark) a TV's peak image detail actually is. And unless specifically noted with the term "ANSI" or "full on/full off" or "dynamic", a person would find it difficult to make any valid comparisons to other TVs in terms of contrast.
	www.pcmag.com /article2/0,1895,2040968,00.asp (1109 words)

	Contrast Ratio - TechSpot OpenBoards (Site not responding. Last check: 2007-10-31)
		The contrast ratio shows you how big is the difference between "fl" and "white" pixels.
		500:1 ratio means that a maximum white pixel has 500 times the intensity of a flest fl pixel.
		Or it could be that companies just release those as their 'budget' monitors so they don't spend the money to make it have a real good contrast ratio if its just going to be sold for somebody's grandmother's comp to get email on.
	www.techspot.com /vb/topic16436.html (475 words)

	Contrast ratio
		When referring to a display, the contrast ratio is a figure used to measure the luminance difference between the brightest white and the darkest fl.
		The contrast ratio will be listed as y:z where 'y' is the brightest white and 'z' is the darkest fl.
		An example of a standard contrast ratio for computer monitors and LCD displays is 200:1, a number higher than this, such as 600:1, will have a brighter display.
	www.computerhope.com /jargon/c/contrati.htm (109 words)

	GameSpot Forums - General Hardware Discussion - About contrast ratio
		Or then again is 1000:1 a good contrast ratio.
		My monitor has unlimited contrast ratio so i'm spoiled but my sdtv is okay so i hope it will be just a little better.
		contrast levels on sdtv's is where big lcd's need to get to,1000:1 is a good contrast ratio.
	www.gamespot.com /pages/forums/show_msgs.php?topic_id=24938908 (243 words)

	Luminosity contrast ratio \| 456 Berea Street
		WCAG (Web Content Accessibility Guidelines) 2.0 suggests a new method of ensuring that there is enough difference between foreground and background colours: calculating the luminosity contrast ratio.
		To help designers understand how luminosity contrast is different from colour contrast, Gez Lemon has written an article that explains the Luminosity Contrast Ratio Algorithm.
		Gez has also created a Luminosity Contrast Ratio Analyser that will calculate the luminosity contrast ratio for you.
	www.456bereastreet.com /archive/200601/luminosity_contrast_ratio (1007 words)

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