Today a professional cameraman, Yoshtio Derman, came in to teach us about camera settings. As a group we focused on different camera settings; we looked at white balance and how it had an impact on images. White Balance refers to the adjustment in film imaging that corrects the colour balance of the lighting. A digital camera needs to find a reference point which represents white. It will then calculate all the other colours based on this white point. So if the camera knows the wall is supposed to be white, it will then compensate all the other colours in the scene accordingly. White objects will appear white, rather than coloured - e.g. yellow when lit by tungsten filament lights, or excessively blue under sunlight. This is because when an image is shot under different conditions white does not appear white and so, white balance corrects the balance of lighting.
This is the colour temperature - typical light source
Source: http://www.dpreview.com/learn/?/Glossary/Digital_Imaging/White_Balance_01.htm
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