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Spatially dependent white balance for fill flash photography

We present a method to perform multi-illuminant white balance in uncontrolled scenes partially illuminated by a known flash or strobe. The outcome minimises the color cast associated to the difference between the illuminants. It is based on two captures taken consecutively, one in the original conditions and another including the artificial illumination; a flash/no-flash image pair, in which all the capturing settings are kept the same in both cases. The images obtained are used to create a spatial map of the flash contribution that allows for a spatially dependent color correction in the flash capture.