Upon return, you notice that the garment mysteriously changed color. The reason that this occurred was because of the lighting. The fluorescent lights at the store is bluer or higher in color temperature than the tungsten lamps at your home. Lighting used in TV is calibrated to one of these two situations. The camera must be adjusted to operate in different lighting conditions.
Most pro cameras have a filter wheel located behind the lens.
Another switch or mechanism that you as the videographer should be aware of is the white balance. This switch changes the CCD or tube's sensitivity to colors. To calibrate, all you need is a plain, white piece of paper or white foamboard. Place the white object in front of the camera while holding down the white balance button. Most new cameras will display a message in the viewfinder indicating that the white balance is being adjusted and will also indicate that the camera has finished adjusting.