Similar to white balance autobracketing, you can manually set the color bias of images to a single setting by using white balance shift. The color can be biased toward blue (B), amber (A), magenta (M), or green (G) in up to nine levels measured as mireds, or densities. Each level of color-correction you set is equivalent to 5 mireds of a color-temperature conversion filter. When you set a color shift or bias, it's used for all images until you change the setting.
On the 5D Mark II, color compensation is measured in mireds, contracted from the term micro reciprocal degree, a measure of the density of a color temperature conversion filter — similar to densities of color-correction filters that range from 0.025 to 0.5. Shifting one level of blue/amber correction is equivalent to 5 mireds of a color temperature conversion filter.
The white balance shift technique is handy when you know that a particular lighting needs correction, such as cooling down an extremely warm tungsten light source, or in the same way that you'd use a color-correction filter with a film camera for warming up or cooling down outdoor and indoor light. To set white balance shift, follow these steps:
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