A pixel processor employing an image processing technology by a computer capable of enhancing color identity. The pixel processor comprises a means performing color vision conversion processing for varying the component in the luminance axis direction depending on the component in the selected axis, i.e. any one of first axis and second axis, out of the component in the luminance axis direction, the component in the first axis direction and the component in the second axis direction included in pixel data represented as positional data in a uniform color space defined by three orthogonal coordinate axes system of the luminance axis indicating luminance, and the first and second axes indicating chromaticness index.