Color adjusting method, color image forming method, and color image forming device

A color adjusting method of reproducing a color of a recording medium and a color to be obtained by overprinting plural color materials including a pigment on the recording medium, by changing output densities of plural fundamental colors, the color adjusting method including the steps of: receiving an input of a desired adjusting value for at least one plain color among plain colors obtained by printing each of the plural color materials; adjusting output intensities of the plural fundamental colors composing said one plain color, by using the inputted adjusting value; and adjusting the output intensities of plural fundamental colors composing a color to be obtained by overprinting a color material used to get said one plain color and at least the other one of the plural color materials, by using the inputted adjusting value.