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White Balance and Daylight
Photographs taken under different light source seem to have a tint of certain colour cast. For instance, photographs taken at the shopping mall with the flashlight turned off look reddish orange in colour, and pictures taken under florescence lighting seem a bit greenish.
This is due to the fact that different light sources are actually coloured. This colour depends on the temperature of the light source and photographers call it colour temperature. For instance the morning sun is reddish in colour because the morning sunlight is warm, the noon sun is bluish white because noon sun is the hottest and by late afternoon we are getting a yellowish sun as the sunlight is less hot than the noon sun. Photographs taken under these conditions are colour cast according to the colour temperature of the light source.
For film cameras, professional photographers have a choice of films designed for different colour temperatures, the common ones being daylight and tungsten films. Most consumers don't care or don't know what this colour cast is all about, and use daylight film for all purposes. A good colour lab can correct this colour cast during printing and colour compensation optical filter can also be used with many film cameras to correct this colour cast. Some people may not want to correct this colour cast because depending on what you are expressing in your picture, the colour cast can add to the atmosphere of your picture.
Digital cameras are also subject to this colour cast from colour temperature of the light source. Most consumer digital cameras do not accept optical filter so it can't use colour filter to compensate for this colour cast. However, digital cameras have a different way of handling this colour cast. They don't need the optical filter to handle this and digital camera are more advance in this aspect as they do it digitally and this is called the White Balance setting in your digital camera.
White Balance is one important setting you should have on your digital camera.
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