In order to evolve the digital minilab systems further, performances required for color paper are enhanced digital image quality and rapid processing suitability. The subjects imposed on silver halide emulsion for color paper are to make contrast moderately high for high-intensity exposure, to sensitize smaller emulsion grains effectively and for grains to adsorb hydrophilic sensitizing dyes tightly. The development of dopants, whose electron-releasing time is less than 1 sec, are especially important in order to improve high intensity reciprocity law failure of silver chloride emulsion. The modification of surface structure of silver chloride emulsion grains with iodide ions is effective for both increase in sensitivity of the emulsion containing smaller grains and tight adsorption of hydrophilic sensitizing dyes to the grains.