White Balance

White Balance is the determined 'color' of white light on film. But white light has no real color, our brains perceive the shift between the varying temperatures from various light sources. Sunlight is a blueish light (technical term), while fluorescent and incandescent lights are green and orange, respectively. And these colors are due to the temperature at which these lights are emitted. In early photography, this white balance didn't make much difference, but with the advent of color, things changed.