An image processing device comprising: an image input unit that receives an input image; a gradation correction value acquiring unit that acquires a gradation correction value representing a ratio of a luminance component of said input image and a luminance component of an output image; a chroma analyzing unit that calculates a chroma correction value, in which the total sum of degrees of chroma discrepancy between an analysis image equal to or different from said input image and a corrected image obtained by correcting a luminance component of said analysis image on the basis of one gradation correction value is the minimum, in correspondence with said gradation correction value, on the basis of receiving said analysis image, and calculating a chroma correction value associated with the acquired gradation correction value by: correcting the analysis image using the acquired gradation correction value and several different chroma correction values, for each of the corrected analysis images corresponding to the different chroma correction values, calculating a sum of degrees of chroma discrepancy in an isochromatic color space in which inter-color distances in a color space approximates to human sense differences in color, and selecting the chroma correction value associated with the corrected analysis image whose sum of degrees of chroma discrepancy is minimum; and an image output unit that outputs as said output image an image obtained by correcting said input image received by said image input unit on the basis of said gradation correction value acquired by said gradation correction value acquiring unit and said chroma correction value correlated with said gradation correction value; whereby the gradation correction is performed by correcting a Y component in a YUV color space or a YCrCb color space; and whereby the chroma correction value is applied to chrominance components U and V in the YUV color space or chrominance components Cr and Cb in the YCrCb color space. an image input unit that receives an input image; a gradation correction value acquiring unit that acquires a gradation correction value representing a ratio of a luminance component of said input image and a luminance component of an output image; a chroma analyzing unit that calculates a chroma correction value, in which the total sum of degrees of chroma discrepancy between an analysis image equal to or different from said input image and a corrected image obtained by correcting a luminance component of said analysis image on the basis of one gradation correction value is the minimum, in correspondence with said gradation correction value, on the basis of receiving said analysis image, and calculating a chroma correction value associated with the acquired gradation correction value by: correcting the analysis image using the acquired gradation correction value and several different chroma correction values, for each of the corrected analysis images corresponding to the different chroma correction values, calculating a sum of degrees of chroma discrepancy in an isochromatic color space in which inter-color distances in a color space approximates to human sense differences in color, and selecting the chroma correction value associated with the corrected analysis image whose sum of degrees of chroma discrepancy is minimum; and correcting the analysis image using the acquired gradation correction value and several different chroma correction values, for each of the corrected analysis images corresponding to the different chroma correction values, calculating a sum of degrees of chroma discrepancy in an isochromatic color space in which inter-color distances in a color space approximates to human sense differences in color, and selecting the chroma correction value associated with the corrected analysis image whose sum of degrees of chroma discrepancy is minimum; and an image output unit that outputs as said output image an image obtained by correcting said input image received by said image input unit on the basis of said gradation correction value acquired by said gradation correction value acquiring unit and said chroma correction value correlated with said gradation correction value; whereby the gradation correction is performed by correcting a Y component in a YUV color space or a YCrCb color space; and whereby the chroma correction value is applied to chrominance components U and V in the YUV color space or chrominance components Cr and Cb in the YCrCb color space.