White Balance

White balance (sometimes color balance, gray balance, or neutral balance) refers to the adjustment of the relative amounts of red, green, and blue primary colors in an image such that neutral colors are reproduced correctly. Color balance changes the overall mixture of colors in an image and is used for generalized color correction.Most electronic cameras have a means to select the type of illumination under which the photography is being done. Another option on some cameras is a button which one may press when the camera is looking at a gray card or other neutral object, to capture a "custom" color balance. A very common option is "automatic white balance" (AWB), which may be based on a scheme such as Retinex, an artificial neural network or a Bayesian method.
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