Image display device, image display method, and image display program

An image display device having an optical modulation element, which modulates light emitted from a light source according to display information, and displaying a display image based on the display information, the image display device comprising:

• a gray-scale range change processing unit that performs a gray-scale range change process of changing the gray-scale range of the display information by increasing each pixel value, corresponding to each pixel, included in the display information on the basis of the brightness information on the brightness of the display image based on the display information;
• a color conversion processing unit that performs a color conversion process according to the brightness information with respect to the display information so that the display image can be color-reproduced within a predetermined color space;
• and
• a display and driving unit that drives the optical modulation element on the basis of the display information having been subjected to the gray-scale range change process and the color conversion process so as to display the display image.