# What does contrast ratio mean

What Is Contrast Ratio For Projectors? Explained By ProjectorsLab

The ratio of the brightest white to the darkest black on a TV or computer monitor. The larger the number, the greater the extremes; for example, car headlights can appear brilliant next to the. Mar 10,  · Since contrast ratio is the ratio of light reflected from all black scenes and all white scenes, it means that the more ratios you have, the more your light reflects on both blacks and whites. An example of the contrast ratio is meaning that is the white scenes that are times and 1 is the black level.

We attempt to explain why dynamic contrast ratio isn't a big deal when it comes to purchasing a new computer monitor. Vendors want to sell you stuff! There, it's finally been meaj. Don't believe me? Well, you wouldn't be the first, but thankfully, I contraast evidence. Within the cpntrast year I've seen a new doe, called dynamic contrast ratio DCRtossed around for computer displays.

If you didn't know before, contrast ratio is simply the difference between the darkest blacks and the brightest whites a given display can produce. Typically, computer displays have a contrast ratio of about However with DCR, you'll see numbers what does contrast ratio mean10, and higher. I also covered this topic in less detail but with a sexy voice thrown in in episode 2 of the Inside CNET Labs podcast.

Before a monitor is released to the public it goes through a bunch of testing in the vendor's own lab. These tests produce the specs that the vendor will then publish with the release. Specs like maximum brightness, pixel pitch, pixel response time, contrast ratio, and dynamic contrast ratio are all determined in the vendor's own lab.

When testing normal contrast ratio, vendors use a device that measures light to determine how much light is emanating from a display while it's showing both a completely black and a completely white screen. They then take each number, do a bit of math, and come up with the contrast ratio. When you turn your brightness setting down, you're actually just dimming the lamp in the back. When the vendors dim the backlight to get the contrast ratio score, they doea it to a point, but do not turn it off.

When the video signal is black tatio near black, this triggers the backlight to rstio into standby mode. Once this is triggered, the darkness of the black level increases by a factor of 10 or more. At this point the vendor takes its reading how to make a poster on photoshop elements the dark screen and compares it with the white screen reading it got before.

Since this new dark screen level is so dark, it increases the contrast ratio. The problem is that the screen only gets this dark when the video signal is black or near black--not very useful when you're watching a movie, or playing a game, or doing pretty much anything. The primary reason for soes this feature is that the contrast ratio dos from to 10, and congrast 20, for computer displays and even higher for televisions.

Direct contrast ratio works differently here than with lamp-based LCDs. When a portion of an image in a movie is relatively dark, the LEDs in that local area of the screen are dimmed.

This occurs on a frame-by-frame basis and lowers the black level what is global warming children that dark area only. Unfortunately, this implementation has its weaknesses, as well, as there can be conteast noticeable visual glitches in the areas that darken.

So, after the testing is done, the vendor publishes whta super-high number, and Joe Consumer not youof course, loyal reader, but someone else goes into the local Best Buy, looking to get a new monitor for his 5-year-old Compaq desktop that was what are the immediate effects of methamphetamine down to him by his younger, more tech-savvy brother. He looks at the specs and sees that monitor A has a 10, DCR, while monitor B has a contrast ratio of Well, bigger numbers mean better, right?

So, ehat goes for the display with DCR. And that's fine if A does everything else you want it to do. If a display looks good with the type of content you plan to use on it, has the connections you want, is the right size and price, then by all means get it. Don't get it, however, just because of some spec that means jack when wnat actually using the display or has not been implemented contrst enough for the glitches not to what does contrast ratio mean, as is the case with LED-based DCR.

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Just what's so 'dynamic' about contrast ratio anyway? Eric Franklin. We test monitor contrast ratio in a secret, undisclosed location. Discuss: Just what's so 'dynamic' about contrast ratio anyway?

A misleading spec, contrast ratio is still important to understand

Jan 26,  · Contrast ratio is a ratio that indicates the range between the brightest point and the darkest point that a display can produce. For example, if the ratio is , it means that the brightest white is times brighter than the blackest black. Sep 12,  · The contrast ratio is the ratio between the luminance of the brightest white and the darkest black that a monitor can produce. Higher contrast ratios typically mean deeper blacks, which makes a big difference in overall picture quality. It’s of particular importance for dark scenes in movies and games, especially in a dark room. Mar 19,  · Contrast ratio, put simply, is the difference between the brightest a TV can be, and the darkest. More so than color (quantum dots or otherwise), Author: Geoffrey Morrison.

Contrast ratio is a ratio that indicates the range between the brightest point and the darkest point that a display can produce. For example, if the ratio is , it means that the brightest white is times brighter than the blackest black.

Ideally, contrast ratios would be tested in the exact same conditions, using the exact same procedures, with carefully calibrated equipment and neutral professionals administering the test. Unfortunately, this is not the case, which means that the measurements can be extremely variable and not always very reliable. Companies may test their contrast under various conditions, using various methods, and the claims they make may be difficult to reproduce.

This provides the biggest number, because the contrast will be quite radical, but these conditions are rarely seen in the real world. Some companies use other methods such as a checkerboard of white and black squares, which provide more realistic conditions and therefore a more accurate contrast.

The method used is not always disclosed by the company, however, which can make it difficult to judge the reliability of the stated measurement. Theoretically, the better the contrast ratio, the better the quality of the display, but displays can also be affected by the conditions where they are used. A television, for example, will have greater contrast in darkness than it will in light conditions.

The quality of the material being displayed can also have an impact, as a poor recording will look bad even on the best display. Furthermore, the human eye's ability to discern contrast and detail are limited, which means that two displays with different ratios can look very similar to the average consumer.

In addition to being important for displays, this ratio also has an impact on the quality of recording devices like cameras. If the ratio is high, the device will be able to reproduce high levels of contrast, creating cleaner, crisper, better-quality images. With a low ratio, quality will also be lower, and it will usually be impossible to clean up or improve the image because the necessary data will be missing since it was never captured.

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a wiseGEEK researcher and writer. Mary has a liberal arts degree from Goddard College and spends her free time reading, cooking, and exploring the great outdoors.