It is important to know a kind of taking illuminant in negative color film for improving the color reproduction of photographic printing. In this paper, a new method is presented for discrimination of taking illuminant based on the chromaticities and cumulative distribution function calculated from the R, G, B densities of negative color film. 220 pictures taken with under the three illuminants, daylight, tungsten lamp and fluorescent lamp, were correctly classified into those three groups with 93.4% discrimination ratio. It is also shown that the image processing results of skin color detection from negative color film.