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Darth Shiv on May 2, 2012 4:26 AM It's a funny sort of problem to quantify but as an example, my LCDTV is a few years old now and it is fluoro backlit. If you set thedesktop background to black and hide everything, the dynamiccontrast sets the fluoro backlight as low as it can go. It doesn'tappear "black" in the sense that you can still see a white-ish"glow" emanating from the screen. It illuminates the area aroundit. In this case, the fluoro backlight is seeping through. This new LCD monitor on my PC is far better at this test. There isfar less illumination. The LED backlighting is much better at notseeping through. So what you say? Well if you are watching a movie in a dark roomand it has "black bars", the better the black, the less you noticethem. Truer black just looks better. In a dark room, you'd want blacker blacks. In a bright room, ifyour peak contrast is lacking, the colours will appear a bit washedout. So that's where you want higher peak illumination. Reply captaincranky on May 2, 2012 4:52 AM You have to examine the issue in photographic terms. An LCD screenis in reality a color transparency. It's basically an animatedlight box. A photographer's light box is usually powered byflorescent lights. The darkest a particular film can register is called "Dmax"(maximum density) and the differential until where the film clearscompletely becomes the contrast ratio. Point being, at maximum illumination the screen must still preventall light from passing, or all you see is the light source, and nodetail. In TV jargon that's called, "blooming", in photography,it's generally referred to as "blown out highlights. LIght bleed is common in LCD TVs and monitors, but it doesn'treally enter into the overall scenario, it's design flaw that isdifficult to eliminate, so it's ignored. You need at least very basic understanding of the "Zone System" ofphotography, to understand where the various parts of a scene fallin relation to exposure / negative / print density. Slide film, as well as LCD will obviously entertain a much greatercontrast ratio than will a paper photograph, which is limited bythe absolute reflectivity of the paper base, at about 40 or 50 to 1 You still couldn't correctly evaluate an LCD screen, unless youwere in a "lightproof" room, and all adaptive controls, would haveto be neutralized. This is the same rule that applies to evaluating sound emittingdevices, as they must be put through their paces in an "anechoicchamber". Reply. We are high quality suppliers, our products such as Application Show , Plastic Raw Material for oversee buyer. To know more, please visits Plastic Resins.
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