An image processing apparatus for supplying image data, to be formed by an image forming apparatus, to the image forming apparatus includes an obtaining unit for obtaining information on first environment light and second environment light different from the first environment light; a converting unit for converting data, defined by a color space independent of the image forming apparatus, of the image data into first image data defined by a color space dependent of the image forming apparatus depending on the first environment light and then for converting the first image data into second image data defined by a color space independent of the image forming apparatus depending on the second environment light; a discriminating unit for discriminating whether or not a color difference between the first image data and the second image data is a predetermined value or more in an area in which the first image data and the second image data correspond to each other; and a display controlling unit for controlling a display unit so that the image data is displayed on the display unit in an image area including an area in which the color difference is the predetermined value or more and including an area in which the color difference is less than the predetermined value.