An image processing apparatus includes: an output unit that outputs a tone-correction-parameter generation sheet and a scanner-profile generation sheet identical in layout of patch columns, each containing patches of different tone values, formed thereon; a scanning unit that scans the patches at scanner positions on a platen; a scanner-profile creating unit that creates, for each of the scanner positions, a scanner profile specifying a relationship between readout values of patches on the scanner-profile generation sheet and color measurement values of the patches measured with a colorimeter; a color-measurement-value deriving unit that determines, from readout values of the patches on the tone-correction-parameter generation sheet and the scanner profiles for the scanner positions, color measurement values of the patches; and a calculating unit that calculates a tone correction parameter for correcting differences between the color measurement values and target color measurement values for the patches on the tone-correction-parameter generation sheet.