An image display system, image processing method, and program that make it possible to reproduce the colors of an image more rapidly in accordance with the user's preferences. The image display system includes: a color gamut calculation section that calculates a target color gamut based on a target profile within a target profile storage section that was selected by the user, and also calculates a displayable color gamut based on a projector profile within a projector profile storage section and environmental information from a colored-light sensor that detects the visual environment; a matrix generation section that generates a conversion matrix according to the relationship between the target color gamut and the displayable color gamut; and a matrix converter section that uses the thus-generated conversion matrix to convert image information; whereby image information is converted and image is displayed.