TAILIEUCHUNG - Chiếu sáng trong truyền hình - Television Lighting Television is a means of changing

Television is a means of changing patterns of light into electrical signals for storage or transmission and then recreating those patterns on a screen. In order to do this well, the television camera must be presented with properly illuminated scenes. The three important considerations are overall level, contrast range, and color temperature. Level Lighting levels for television are generally set by adjusting the incident light, or the light striking the subject. The unit of measure for incident light is the foot candle, which is the amount of light produced by a standard candle at a distance of one foot | Chiếu sáng trong truyền hình English Television Lighting Television is a means of changing patterns of light into electrical signals for storage or transmission and then recreating those patterns on a screen. In order to do this well the television camera must be presented with properly illuminated scenes. The three important considerations are overall level contrast range and color temperature. Level Lighting levels for television are generally set by adjusting the incident light or the light striking the subject. The unit of measure for incident light is the foot candle which is the amount of light produced by a standard candle at a distance of one foot. Lighting measurements are made using an incident light meter which has a white plastic cover over the sensing element and a logarithmic scale calibrated in foot candles. To measure the useful incident light for television the meter is held near the subject and pointed toward the camera. The minimum acceptable level for color television depends on the ability of the lens to transmit light to the camera the sensitivity of the pickup tube or chip and the amount of depth of field you need. For high-quality pictures you need something between fifty and two hundred foot candles. Most cameras can be operated in light ranging from the minimum up to ten thousand foot candles or fairly bright sunlight. Where lighting conditions fall outside this range steps must be taken to bring the lighting level into line with the capabilities of the camera. With too little light additional lighting must be added. With too much special neutral density filters must be used on the camera. Absolute rock bottom You ll see cameras advertised as 2 LUX or 4 LUX cameras. 2 LUX is equal to .19 foot candles. 4 LUX is about .37 foot candles. I was suspicious so a number of years ago I set up an ordinary candle one foot away from a white square on a black background. I tested two cameras. The first was a popular CCD camera requiring four LUX for .

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