A image forming apparatus includes a display, a user input device, a printer unit, and a processor. The processor causes a color patch image output screen to be displayed. The color patch image output screen includes user selectable hues. Once the hue selection is received a color patch image based on the hue selection is displayed. The color patch image includes several different colors indexed by a color number value. A color patch number input screen is then displayed and includes a color to be adjusted input field and a target color input field. User inputs for a first color patch number and a second color patch number are received via the displayed screen. The processor then performs a color conversion such that the first color patch number corresponds to the second color patch number when the printer unit prints an image using the image data.