White balance is a very widely used effect to get an even light color in photos. It used to be more complicated of a process, but now it can easily be adjusted on most digital cameras.
You can point a [digital] camera at a white or grey card so it fills the frame, then press the White Balance button or option. This card has to be reflecting the light produced in the room. This is how to manually set the WB on digital cameras, and it allows the camera to calculate what it needs to filter when it takes a picture in order to match the lighting.
Light has a temperature in photography; lower temperatures will be redder, higher temps will be bluer. The levels are around 17000K to 16000K (match light to full sunlight basically). Different lights like incandescent and "warmer", orange-er lights will do different things to the overall balance. Using orange and blue filters cancels out the different balances to make the overall photo a relatively "whiter".
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