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Different types of light shine with different colors. For example, tungsten lights are redder, or warmer, than fluorescent light. Now, while your eye does an amazing job of adjusting automatically to different types of light, so that colors always look correct, your camera doesn't fare so well. Your camera has to be calibrated to the type of light that you are shooting in. If it's not, then colors are going to appear wrong. This process of calibration is called white balancing. Now, the idea is that you calibrate the camera, so that white appears correct. Because white contains all other colors, if you can get white looking good, then you get all the other colors for free.
By default, your camera is set to auto white balance. With auto white balance, the camera will attempt to continuously white balance itself on the fly as you shoot. Your Mark III defaults to auto white balance, and you can see that indicated right here on the status display; that's what that AWB stands for. If yours has been changed, you can change it back by pressing the metering white balance button, and then turning the quick control dial to cycle around until you get to AWB. There is really not much more to auto white balance. You set it, and it neither works, or it doesn't.
Your Mark III, though, does have a white balance shift feature, and a white balance auto bracketing feature. You get to both of those through the menuing system. We are not going to cover those in this course. They are very complicated, and in my opinion, they are not that useful. There are other ways to deal with the problems that they solve. If you want to know more about those two features, though, check out page 140 of your Mark III manual. You'll probably find that you can stick with auto white balance for most of your shots. Where it will start to let you down is in shady light, or situations with mixed lightings; sunlight streaming into a fluorescently lit room, for example.
In those instances, you'll need to change to a different white balance setting.
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