Lowering the "brightness" results in making dark portions of the image darker, resulting in decreased detail and "muddy" look in darker areas of the image. The way a TV or Video projector's brightness control works is by adjusting the amount of black level that is visible on the screen.In other words, Brightness is the subjective interpretation (more bright, less bright) of perceived Luminance, not actual generated Luminance. Brightness may also be expressed as a percentage more bright or a percentage less bright from a subjective reference point (such as the Brightness control of a TV or video projector-see further explanation below).Brightness can be referred to as the ability to detect differences in Luminance. Brightness is not the same as actual quantified Luminance (light output).LCD projectors have the capability of delivering equal light output level capability for both white and color, while DLP projectors that employ color wheels do not have the capability of producing equal levels of white and color light output. For video projectors, there is a difference between the light output capabilities between projectors that use LCD and DLP technology.When comparing an HDR-enabled TV that can output 1,000 Nits, with an HDR-enabled video projector that can output 2,500 ANSI lumens, the HDR effect on the TV will be more dramatic in terms of "perceived brightness".Although you will notice that a 1,000 Nit capable LED/LCD TV will look brighter than an OLED TV when, say, both are displaying the Sun or very bright sky, the OLED TV will do a better job at displaying the darkest portions of that same image, so the overall Dynamic Range (the point distance between maximum white and maximum black may be similar). However, remember, the standard applies to the maximum Nits output, not average Nits output. Even though the official optimum HDR standard for LED/LCD TVs is the ability to display at least 1,000 Nits, the official HDR standard for OLED TVs is only 540 Nits.However, unlike an LED/LCD TV, and OLED TV can produce absolute black. OLED TV technology cannot support as many Nits of light output as LED/LCD TV technology can. This is especially important for HDR-enabled OLED TVs in relation to LED/LCD TVs. A key point is that the ratio between the brightest objects and darkest objects be the same, or as close to the same as possible, to result in the same visual impact. Also, different colors that are displayed contribute to different light output levels within a frame or scene. However, other portions of the image, such as buildings, landscape, and shadows, require a lot less light output, perhaps on only 100 or 200 Nits or Lumens. If you have a scene with the Sun in the sky, that portion of the image may require the TV or video projector to output the maximum number of Nits or Lumens.All these variations require different levels of light output. Frames or scenes most often display a range of bright and dark content, as well as a variation of colors. When a TV or video projector is touted as able to output 1,000 Nits or Lumens, that does not mean that the TV or projector outputs that much light all the time.
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