According to an embodiment, an image processing apparatus includes a display device and a processor. The display device displays a first image corresponding to first image data based on a document to be adjusted, and a second image corresponding to second image data based on a document for comparison. The processor creates a first conversion table by calculating a color value defined in a first color space and corresponding to a first position specified in the displayed first image, and a color value defined in the first color space and corresponding to a second position specified in the displayed second image.