1. A method with white balancing, comprising: setting an illuminant detection region within a chrominance space of an image based on an exposure integration time (EIT) indicative of an amount of light collected for the image when the image was captured, the EIT being used to determine a range of the illuminant detection region; and detecting an illuminant of the image, by using data relative to the set illuminant detection region, within a color gamut of the image corresponding to the set illuminant detection region.