An image processing device includes a focal pixel setting unit, a near pixel setting unit, a calculating unit, a target pixel determining unit, and an editing unit. The focal pixel setting unit is configured to set a focal pixel among a plurality of pixels in an original image that is represented by original image data. The near pixel setting unit is configured to set a pixel near the focal pixel as a near pixel. The calculating unit is configured to calculate a characteristic value related to luminance of the focal pixel and luminance of the near pixel. The target pixel determining unit is configured to determine, as the target pixel, the focal pixel whose characteristic value satisfies a prescribed condition. The editing unit is configured to generate edited image data by editing the original image data. The edited image data represents an edited image having a supplemental image superimposed on the original image. The supplemental image is superimposed on an area encompassing the target pixel.