Configuration and Operation99GainA nominal video signal level is usually 1 volt peak-to-peak for composite video, 0.7 volts forcomponent or RGB video, or 0.3 volts for the chrominance subsection, at which level a fullysaturated picture is transmitted to the acceptor. However, for cases where the video signal isattenuated, a low-noise, high-gain analog amplifier is built into quality video processing equipment.This amplifier provides video gain control whereby the video signal can be boosted or reduced. Darkpictures resulting from low level lighting are easily adjusted.The Gain drop-down menu enables controlling the video gain from Off or in steps from 1 to 9.7.5.2 White BalanceShown below is the drop-down menu for controlling the camera’s white balance (color balance).Figure 91: Camera Settings Screen – White BalanceA camera needs to find a reference color temperature as a way of measuring the quality of a lightsource for calculating all other colors. The unit for measuring this ratio is in Kelvin (°K) degrees. Youcan select one of the White Balance control modes according to the operating environment. Thetable below shows the color temperature of some light sources for reference.Light Sources Color Temperature in KCloudy Sky 6,000 to 8,000Noon Sun and Clear Sky 6,500Household Lighting 2,500 to 3,00075-watt Bulb 2,820Candle Flame 1,200 to 1,500Three white balance modes are available: Auto – The Auto Balance White mode computes the white balance value output using colorinformation from the entire screen. It is suitable for an environment with a light source colortemperature in the range of approximately 2,700 ~ 7,500K. ATW (Auto Tracking White Balance) – The Auto Tracking White Balance functionautomatically adjusts the white balance in a scene while temperature color is changing. TheATW Mode is suitable for an environment with a light source color temperature in the rangeof approximately 2500 ~ 10,000K.
