For many years, we've been told that color casts—those shifts in color towards blue or yellow—are a bad thing and should be corrected at all costs. In the film days we used color-correction (CC) filters to battle them and, in the digital age, most choose to set their cameras to auto-white-balance (AWB), in effect telling the camera to detect and neutralize color casts automatically. After all, neutral whites and lack of color casts are desirable and natural, right? Wrong!
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