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kontrast
- Thread starter umazaki
- Rozpoczęty
Pro7 HD i Sat 1 HD w akcji ... (komentarz)
zależy, co przez to rozumiesz
moim zdaniem tak
postaram się :
Dynamic Contrast technology enables the contrast ratio of LCD panels to increase from the current 1000:1 to 50,000:1, which has far exceeded the upper measurement limits of current measuring instruments for LCD displays. This technology utilizes an internally built-in image processing system that can analyze image signals and command the backlight board to adjust brightness accordingly. Therefore, even when watching an image with a completely black background, e.g., fireworks against a dark sky, the background can remain dark black without any color shift.
marketingowa?
zależy, co przez to rozumiesz
a może sie mylę?
moim zdaniem tak
ktoś oświeci?
postaram się :
Dynamic Contrast technology enables the contrast ratio of LCD panels to increase from the current 1000:1 to 50,000:1, which has far exceeded the upper measurement limits of current measuring instruments for LCD displays. This technology utilizes an internally built-in image processing system that can analyze image signals and command the backlight board to adjust brightness accordingly. Therefore, even when watching an image with a completely black background, e.g., fireworks against a dark sky, the background can remain dark black without any color shift.
pmcomp ma rację.
Zresztą ciekawy temat, taki sam marketingowy bullshit jak response time matrycy.
Im czarniejsza czerń tym kontrast bardziej dąży do nieskończoności (jak zawartość cukru w cukrze).
Dla tych co nie czytają w oryginale, tylko wspomnę, że pomiar odbywa się w zupełnej ciemności, co nie odpowiada normalnym warunkom, zawsze jest jakieś oświetlenie i odbicie światła od panelu.
Oraz, że ludzkie oko rozróżni kontrast =100 tylko, przy całkowice czarnym tle, większe różnice będą zignorowane.
Wprost też napisano, że podanie wysokich wartości kontrastu to metoda na sprzedaż tandetnych LCD.
Jest to ważne w osiągnięciu czerni, ale nie można się dać zwariować.
Zródło: Wikipedia
Pozdr.
The contrast ratio is a metric of a video display, defined as the ratio of the light intensity of the brightest possible color to the darkest possible color a display is capable of displaying simultaneously. The higher the contrast ratio, the better the display is.
Examples are 800:1, 700:1, and 500:1 from higher to lower capability. Infinite contrast ratios can be achieved by devices capable of emitting no light at all as their darkest color. Contrast ratio is most commonly considered in connection with transmissive displays, such as LCD, in which all pixels share the same light emitter, and manipulate the brightness of transmitted light individually. Technological challenges make it hard to design a mechanism to shut off 100% of transmitted light in these displays. Additionally, any optics in front of the matrix of light modulators that can potentially mix the light from different pixels, such as the lens of a DLP/LCD projector, will also degradate the conrast ratio.
Emissive display technologies - where all pixels emit light individually, such as OLED, plasma, and FED - are capable of achieving a very good contrast ratio.
Poor contrast ratio manifests itself in the lack of true black, and in noticeably desaturated colors (the darker is the supposed color - the stronger is the desaturation).
There can't be too much of a contrast - that's a marketing myth, invented to sell cheap LCD displays.
A notable recent developement in the LCD technology is the so called "dynamic contrast". When there is a need to display a dark image, the display would underpower the backlight lamp (or decrease the aperture of the projector's lens using a shutter), but will proportionately amplify the transmission through the LCD panel. This gives the benefit of realizing the potential static contrast ratio of the LCD panel in dark scenes, when the image is watched in a dark room. The drawback is that if a dark scene does contain small areas of superbright light, they may be sacrificed and blown out. This may not sound too bad though, as the static contrast ratio of a human eye is just around 100 and so the details in those highlights might not be resolvable anyway. The trick for the display is to determine how much of the highlights may be unnoticeably blown out in a given image under the given ambient lighting conditions.
Note that the contrast ratio promoted in marketing literature for emissive (as opposed to reflective) displays is always measured under the optimum condition of a room in total darkness. In typical viewing situations the contrast ratio is significantly lower due to the reflection of light from the surface of the display. How much the room light reduces the contrast ratio depends on the luminance of the display, as well as the amount of light reflecting off the display.
In audio, the equivalent is dynamic range.
Zresztą ciekawy temat, taki sam marketingowy bullshit jak response time matrycy.
Im czarniejsza czerń tym kontrast bardziej dąży do nieskończoności (jak zawartość cukru w cukrze).
Dla tych co nie czytają w oryginale, tylko wspomnę, że pomiar odbywa się w zupełnej ciemności, co nie odpowiada normalnym warunkom, zawsze jest jakieś oświetlenie i odbicie światła od panelu.
Oraz, że ludzkie oko rozróżni kontrast =100 tylko, przy całkowice czarnym tle, większe różnice będą zignorowane.
Wprost też napisano, że podanie wysokich wartości kontrastu to metoda na sprzedaż tandetnych LCD.
Jest to ważne w osiągnięciu czerni, ale nie można się dać zwariować.
Zródło: Wikipedia
Pozdr.
The contrast ratio is a metric of a video display, defined as the ratio of the light intensity of the brightest possible color to the darkest possible color a display is capable of displaying simultaneously. The higher the contrast ratio, the better the display is.
Examples are 800:1, 700:1, and 500:1 from higher to lower capability. Infinite contrast ratios can be achieved by devices capable of emitting no light at all as their darkest color. Contrast ratio is most commonly considered in connection with transmissive displays, such as LCD, in which all pixels share the same light emitter, and manipulate the brightness of transmitted light individually. Technological challenges make it hard to design a mechanism to shut off 100% of transmitted light in these displays. Additionally, any optics in front of the matrix of light modulators that can potentially mix the light from different pixels, such as the lens of a DLP/LCD projector, will also degradate the conrast ratio.
Emissive display technologies - where all pixels emit light individually, such as OLED, plasma, and FED - are capable of achieving a very good contrast ratio.
Poor contrast ratio manifests itself in the lack of true black, and in noticeably desaturated colors (the darker is the supposed color - the stronger is the desaturation).
There can't be too much of a contrast - that's a marketing myth, invented to sell cheap LCD displays.
A notable recent developement in the LCD technology is the so called "dynamic contrast". When there is a need to display a dark image, the display would underpower the backlight lamp (or decrease the aperture of the projector's lens using a shutter), but will proportionately amplify the transmission through the LCD panel. This gives the benefit of realizing the potential static contrast ratio of the LCD panel in dark scenes, when the image is watched in a dark room. The drawback is that if a dark scene does contain small areas of superbright light, they may be sacrificed and blown out. This may not sound too bad though, as the static contrast ratio of a human eye is just around 100 and so the details in those highlights might not be resolvable anyway. The trick for the display is to determine how much of the highlights may be unnoticeably blown out in a given image under the given ambient lighting conditions.
Note that the contrast ratio promoted in marketing literature for emissive (as opposed to reflective) displays is always measured under the optimum condition of a room in total darkness. In typical viewing situations the contrast ratio is significantly lower due to the reflection of light from the surface of the display. How much the room light reduces the contrast ratio depends on the luminance of the display, as well as the amount of light reflecting off the display.
In audio, the equivalent is dynamic range.
pytanie założyciela wątku było nad wyraz proste i jasne.
odpowiedź jest również prosta i jasna.
Czy jest to marketing czy nie, można znowu się spierać.
Dla jednych czy to kontrast, czy stopa dynamicznego kontrastu czy time response to "bulshit", dla innych jakaś tam wiadomość.
Trzeba tylko potrafić te informacje zinterpretować
Jak dla mnie czerń ekranu ma zupełnie trzeciorzędne znaczenie, o wiele ważniejsza jest moim zdaniem gradacja szarości
odpowiedź jest również prosta i jasna.
Czy jest to marketing czy nie, można znowu się spierać.
Dla jednych czy to kontrast, czy stopa dynamicznego kontrastu czy time response to "bulshit", dla innych jakaś tam wiadomość.
Trzeba tylko potrafić te informacje zinterpretować
Jak dla mnie czerń ekranu ma zupełnie trzeciorzędne znaczenie, o wiele ważniejsza jest moim zdaniem gradacja szarości
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