|Setting the correct white balance in your digital SLR camera is important to ensure the objects that are white, are actually displayed white within the photograph.If your camera's automatic white balance setting doesn't get the color 'white' correct, it won't render the other colors correctly either.
Doesn't auto white balance fix this problem?
Well, not always!!! While it's true many improvements have been made in todays digital camera's, they still often get white balance settings wrong in certain lighting conditions. If you take your images in RAW format (highly recommended) then sure, go ahead and use auto white balance. If the camera gets it wrong, you can always change this setting later on in your RAW editor.