Provided is an image processing device which enables image display that takes full advantage of a color reproduction performance of a panel without providing a viewer with a feeling of strangeness. In at least one embodiment, an image processing device includes: a first color space converter configured to convert an externally transmitted RGB signal into an XYZ signal; a three-dimensional matching processor configured to perform conversion to tristimulus values of the XYZ signal to generate an XYZ signal; and a second color space converter configured to convert the XYZ signal to an RGB signal for a liquid crystal panel. The three-dimensional matching processor performs the conversion to the tristimulus values such that saturation and brightness of only colors whose chromaticity coordinate is outside a boundary line provided on an xy chromaticity diagram are increased, and maintains the tristimulus values as they are such that colors whose chromaticity coordinate is within the boundary line are displayed in colors accurate to colors represented by the RGB signal.