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In this paper, an efficient data hiding scheme for printed color images is proposed that visualizes on printed color images embedded data that is invisible on a monitor. We accomplished this scheme by using the differences of color gamut between a monitor and printer. The proposed scheme visualizes embedded data by converting one piece of color information, either L*, a*, or b*, to a fixed value when printing. This feature can be easily applied to copyright protection for printed images. Simulation results show the effectiveness of our scheme.