For automatic color printing, it is necessary to identify scenes that have been exposed by illuminating an agent with very narrow ribs and not perform any color correction such scenes. The scenes of the illuminating agent narrow ribs are identified by scanning the original image in three primary coleurs to produce three distributions of color values. The results of the three distributions fool color values stored in the computer and, if the ratio of the standard deviations of one or the other of the two distributions of color value is greater than a first predetermined constant (e.g. 4.0) or less than a second predetermined constant (e.g. 0.25), no correction in color is performed. Said method is particularly useful in a photographic printer using scanning color histogram changes to correct the timing of color shades and to make adjustments to the color balance.
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