![]() They usually have very small zone counts, and the algorithms can't keep up with fast-paced motion, so the leading edge of a bright object in a dark scene ends up looking darker than the rest, and there's a trail of light behind it.īecause of these issues with local dimming, it's almost always more important to look at the native capabilities of a monitor instead of the contrast ratio with local dimming. The few that do, generally speaking, don't work very well. Unlike TVs, most monitors don't have a local dimming feature. The answer is a bit complicated, but basically, it depends. One frequently asked question is which is more important, a panel's native contrast or contrast with local dimming? It's a good question. With OLED monitors, adjusting the OLED light only increases the peak brightness blacks are still perfectly black. With LED Monitors, both white and black will become about equally brighter or dimmer when the backlight is adjusted, preserving the ratio of light to dark. Backlight settings have a very minor impact on contrast, and so you should set it to whatever looks best in your viewing space.If you find it difficult to make out detail in dark images, consider making a slight adjustment to the gamma. Gamma: Gamma doesn't control the depth of black, but it does control the amount of detail you will see in dark portions of an image.Just make sure that both your monitor and your source device use matching RGB settings. Full/Limited RGB: Full RGB may offer slightly more detail in blacks and shadows, but it’s not a big difference compared with limited RGB.We discuss local dimming in more detail here. It can introduce issues like light blooming off of light objects within dark areas, and when done especially poorly, can dim the entire image. It can deepen contrast, and it's worth using when implemented well. Local Dimming: The local dimming feature dims the backlight behind darker portions of the screen.On rare occasions, gamma might be affected, leading to a loss of detail in highlights. We list a recommended setting with all of our reviews, but it's almost always fine to just set this to the maximum. Contrast: Adjusting this will let you affect how much contrast the monitor has.This will get good, basic contrast - meaning no additional contrast-enhancing settings - and with no loss of detail in dark portions of the image. You can find this information in the 'Post Calibration' section of the review. Contrast With Local DimmingĪs a first step, try using the calibration settings we recommend (provided we have reviewed your monitor). For example, a monitor with a contrast ratio of 5000:1 has an approximate black level of 0.02 cd/m². If you want to know the approximate black levels we measured, assume that the white luminance was at 100 cd/m², and divide that by the contrast ratio. ![]() We don't list the actual black level that we measured during testing, but because we measure contrast after calibration, it's easy to work backward. Once we have both these values, the contrast ratio is simply the white luminance divided by the black luminance. ![]() The final black luminance number used in our calculation is the average of these four squares. This is to reduce the impact of black uniformity on our contrast measurement. For the black luminance, we measure the luminance of each of the four black squares surrounding the white center square. The white luminance, which should be close to 100 cd/m², is measured in the center white square. We calibrate the monitor to have a white luminance as close as possible to 100 cd/m², and then we take five luminance measurements using a Konica Minolta LS-100 Luminance Meter. To measure the native contrast ratio, we use a black and white checkerboard pattern to determine the black and white luminance, as described above. The 'Native Contrast' ratio of a display represents the most basic contrast performance of the display, with all image processing and contrast-enhancing features turned off.
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