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Canon® EOS Rebel XSi/450D Guide to Digital SLR Photography by David D. Busch

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White Balance Shift and Bracketing

White balance shift allows you to dial in a white balance color bias along the Blue/Yellow (Amber) dimensions, and/or Magenta/Green scale. In other words, you can set your color balance so that it is a little bluer or yellower (only), a little more magenta or green (only), or a combination of the two bias dimensions. You can also bracket exposures, taking several consecutive pictures each with a slightly different color balance biased in the directions you specify.

The process is a little easier to visualize if you look at Figure 3.10. The center intersection of lines BA and GM (remember high school geometry!) is the point of zero bias. Move the point at that intersection using the left/right and up/down cross ...

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