what is meant by the term contrast ratio? what is the contrast ratio ofa T.V?  

Contrast ratio measures the difference between the brightness in the super-bright portions of a screen vs. the super-dark portions. A 1000:1 contrast ratio would mean that a perfectly white pixel is 1000 times brighter than a perfectly black pixel.

Contrast ratio is one of the most important specs for all TV types.

There are actually two different ways of measuring a TV's contrast ratio. Static contrast ratio measures the difference between the brightest and darkest images a TV can produce simultaneously (sometimes called on-screen contrast ratio). The ratio of the brightest and darkest images a TV can produce over time is called dynamic contrast ratio. Both specs are meaningful, but the dynamic spec is often four or five times higher than the static spec, so make sure you're comparing apples to apples.

Answered by Arti singh at 2:43 PM on June 17, 2008

hi there,

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Answered by Reeta K at 4:31 PM on May 22, 2008

Contrast Ratio is a measurement of the difference in brightness between the whitest white and the darkest black within an image.

Contrast ratio ratings provided by different manufacturers of display devices are not necessarily comparable to each other due to differences in method of measurement, operation, and unstated variables.

measure is the ANSI contrast, in which the measurement is done with a checker board patterned test image where the luminosity values are measured simultaneously. This is a more realistic measure of system capability, but includes the potential of including the effects of the room into the measurement, if the test is not performed in a room that is close to ideal.

Answered by Sharad Singh at 5:21 PM on May 21, 2008

Contrast ratio measures the difference between the brightness in the super-bright portions of a screen vs. the super-dark portions. A 1000:1 contrast ratio would mean that a perfectly white pixel is 1000 times brighter than a perfectly black pixel.

Contrast ratio is one of the most important specs for all TV types.

There are actually two different ways of measuring a TV's contrast ratio. Static contrast ratio measures the difference between the brightest and darkest images a TV can produce simultaneously (sometimes called on-screen contrast ratio). The ratio of the brightest and darkest images a TV can produce over time is called dynamic contrast ratio. Both specs are meaningful, but the dynamic spec is often four or five times higher than the static spec, so make sure you're comparing apples to apples.

Answered by Ashish Yadav at 5:12 PM on May 21, 2008

hi bikers contrast ratio is In reference to computer monitors, the measurement of the difference in light intensity between the brightest white and the darkest black. Contrast ratio is often used in marketing computer monitors, where a high contrast ratio, such as 400:1, represents a better color representation (the better the information will appear against a darker background) on the monitor than a lower contrast ratio, such as 150:1.
The term is used more frequently in reference to LCD monitors than CRT monitors
this is taken from source http://www.webopedia.com/TERM/C/con trast_ratio.html

Answered by laks at 3:12 PM on May 21, 2008

well, A high contrast ratio is a desired aspect of any display, but with the various methods of measurement for a system or its part, remarkably different measured values can sometimes produce similar results. contrast ratio is the measurement of the difference in light intensity between the brightest white and the darkest black. Contrast ratio is often used in marketing computer monitors, where a high contrast ratio, such as 400:1, represents a better color representation (the better the information will appear against a darker background) on the monitor than a lower contrast ratio, such as 150:1.The term is used more frequently in reference to LCD monitors than CRT monitors.

Answered by Saurabh at 2:19 PM on May 21, 2008

Contrast Ratio is a measurement of the difference in brightness between the whitest white and the darkest black within an image.
Contrast ratio is of interest in two situations:
1. Cameras: When recording an image (video, film, photography)
2. TVs, Monitors, etc. When choosing or setting up a playback device (TV, computer monitor, etc)

To learn more about contrast ratio, please visit the site - http://en.wikipedia.org/wiki/C ontra st_ratio

Answered by Shobhit at 2:11 PM on May 21, 2008

hello bikers The contrast ratio is a measure of a display system, defined as the ratio of the luminance of the brightest color (white) to that of the darkest color (black) that the system is capable of producing. A high contrast ratio is a desired aspect of any display, but with the various methods of measurement for a system or its part, remarkably different measured values can sometimes produce similar results.

Contrast ratio ratings provided by different manufacturers of display devices are not necessarily comparable to each other due to differences in method of measurement, operation, and unstated variables.[1] Manufacturers have traditionally favored measurement methods that isolate the device from the system, whereas other designers have more often taken the effect of the room into account. An ideal room would absorb all the light reflecting from a projection screen or emitted by a CRT, and the only light seen in the room would come from the display device. With such a room, the contrast ratio of the image would be the same as the device. Real rooms reflect some of the light back to the displayed image, lowering the contrast ratio seen in the image.

Moving from a system that displays a static motionless image to a system that displays a dynamic, changing picture slightly complicates the definition of the contrast ratio, because of the need to take into account the extra temporal dimension to the measuring process. Thus the ratio of the luminosity of the brightest and the darkest color the system is capable of producing simultaneously at any instant of time is called static contrast ratio, while the ratio of the luminosity of the brightest and the darkest color the system is capable of producing over time is called dynamic contrast ratio
for more inf check source http://en.wikipedia.org/wiki/Contra st_ratio and the contrast ratio of a TV is 100000:1 Contrast Ratio

Answered by raj u at 12:41 PM on May 21, 2008

Well , The contrast ratio is a measure of a display system, defined as the ratio of the luminance of the brightest color (white) to that of the darkest color (black) that the system is capable of producing.

A high contrast ratio is a desired aspect of any display, but with the various methods of measurement for a system or its part, remarkably different measured values can sometimes produce similar results.

Contrast ratio ratings provided by different manufacturers of display devices are not necessarily comparable to each other due to differences in method of measurement, operation, and unstated variables.

Manufacturers have traditionally favored measurement methods that isolate the device from the system, whereas other designers have more often taken the effect of the room into account. An ideal room would absorb all the light reflecting from a projection screen or emitted by a CRT, and the only light seen in the room would come from the display device. With such a room, the contrast ratio of the image would be the same as the device.

Real rooms reflect some of the light back to the displayed image, lowering the contrast ratio seen in the image.

Moving from a system that displays a static motionless image to a system that displays a dynamic, changing picture slightly complicates the definition of the contrast ratio, because of the need to take into account the extra temporal dimension to the measuring process.

Thus the ratio of the luminosity of the brightest and the darkest color the system is capable of producing simultaneously at any instant of time is called static contrast ratio, while the ratio of the luminosity of the brightest and the darkest color the system is capable of producing over time is called dynamic contrast ratio.

Methods of measurement :

Many display devices favor the use of the full on/full off method of measurement, as it cancels out the effect of the room and results in an ideal ratio. Equal proportions of light reflect from the display to the room and back in both "black" and "white" measurements, as long as the room stays the same.

This will inflate the light levels of both measurements proportionally, leaving the black to white luminance ratio unaffected.

Some manufacturers have gone as far as using different device parameters for the two tests, even further inflating the calculated contrast ratio. With DLP projectors, one method to do this is to enable the clear sector of the color filter wheel for the "on" part and disable it for the "off" part This practice is rather dubious, as it will be impossible to reproduce such contrast ratios with any useful image content.

Another measure is the ANSI contrast, in which the measurement is done with a checker board patterned test image where the luminosity values are measured simultaneously. This is a more realistic measure of system capability, but includes the potential of including the effects of the room into the measurement, if the test is not performed in a room that is close to ideal.

It is useful to note that the full on/full off method effectively measures the dynamic contrast ratio of a display, while the ANSI contrast measures the static contrast ratio.

For more details , Please visit the source site :

http://en.wikipedia.org/wiki/C ontrast_ratio

Answered by Alok Gupta at 11:10 AM on May 21, 2008

hi yikes :-
Contrast Ratio is a measurement of the difference in brightness between the whitest white and the darkest black within an image.
Contrast ratio is of interest in two situations:
1. Cameras: When recording an image (video, film, photography)
2. TVs, Monitors, etc. When choosing or setting up a playback device (TV, computer monitor, etc)

To learn more about contrast ratio, please visit the site - http://en.wikipedia.org/wiki/C ontra st_ratio

Answered by shepherd at 8:53 AM on May 21, 2008