A method for color conversion using a color conversion device, the color conversion device including a first conversion unit configured to convert gradation values of an image by means of a Lookup Table for each color of a color space and a second conversion unit in which conversion values are stored at lattice points, wherein the lattice points divide the color space into segments having predetermined gradation intervals, the color space having a predetermined number of gradation values for each color of the color space, wherein the predetermined gradation intervals are intervals between the lattice points, the method comprising: a step of dividing, for each color of the color space, one of input gradations and output gradations, which are in a relationship in accordance with gradation characteristics, into gradation segments having the predetermined gradation intervals, wherein the input gradations and the output gradations comprise respective gradation values, and wherein the gradation characteristics are color characteristics of any display device to be emulated and are reproduced in the second conversion unit; a step of correcting, for each of the gradation segments, each of the gradation values of the other gradations, which are the other of the input gradations and the output gradations, in accordance with the gradation characteristics by multiplying a coefficient so that gradation intervals of the other gradations become equal or proportional to the predetermined gradation intervals; a step of converting, for each color of the color space, by the first conversion unit, the gradation values of the image using the gradation characteristics with the corrected gradation values, wherein the gradation values of the image represented by inputted video signals are inputted to the first conversion unit; and a step of color-converting the image by outputting the gradation values converted by the first conversion unit to the second conversion unit so as to use the gradation values converted and outputted by the first conversion unit and the conversion values stored at the lattice points of the second conversion unit. a step of dividing, for each color of the color space, one of input gradations and output gradations, which are in a relationship in accordance with gradation characteristics, into gradation segments having the predetermined gradation intervals, wherein the input gradations and the output gradations comprise respective gradation values, and wherein the gradation characteristics are color characteristics of any display device to be emulated and are reproduced in the second conversion unit; a step of correcting, for each of the gradation segments, each of the gradation values of the other gradations, which are the other of the input gradations and the output gradations, in accordance with the gradation characteristics by multiplying a coefficient so that gradation intervals of the other gradations become equal or proportional to the predetermined gradation intervals; a step of converting, for each color of the color space, by the first conversion unit, the gradation values of the image using the gradation characteristics with the corrected gradation values, wherein the gradation values of the image represented by inputted video signals are inputted to the first conversion unit; and a step of color-converting the image by outputting the gradation values converted by the first conversion unit to the second conversion unit so as to use the gradation values converted and outputted by the first conversion unit and the conversion values stored at the lattice points of the second conversion unit.