Understanding White Balance

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Daylight
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Cloudy
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Tungsten
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Fluorescent
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Di) White balance (WB) is the process of removing unrealistic color casts, so that objects which appear white in person are rendered white in your photo. Proper camera white balance has to take into account the "color temperature" of a light source, which refers to the relative warmth or coolness of white light.

Dii) It is important to set your white balance because the white balance adjusts the color in the room, it alines with that, it makes more white show up in your picture.