To obtain a duplicated color image improved in saturation and reproducibility of highlight gradation by incorporating a specified magenta coupler into a color photosensitive material used for the original image and for a duplicated image, and specifying the min. transmission density of the color photosensitive material for duplication after the material is treated to form an image.

The original image contains a dye produced from a magenta coupler selected from compds. expressed by formula. The color photosensitive material used for duplication also contains a magenta coupler selected from compds. expressed by the formula. The min. transmission density of the color photosensitive material for duplication after the material is treated to form an image is specified to between ≤0.20 and ≥0.001. In formula, R1 is a hydrogen atom or substituent, Z represents nonmetal atoms necessary to form a five- member azole ring containing 2 to 4 nitrogen atoms and X is a hydrogen atom or a group which can be released by the coupling reaction with an oxidizing agent of a color developing agent.