1. A non-transitory computer-readable medium storing computer-readable instructions, the instructions, when executed by a processor of an image processing apparatus, performing processes comprising: registering, in a storage, a candidate color for each of a plurality of divided areas included in image data indicating an image on a sheet, the candidate color being a color value of a representative color representing color values of a plurality of pixels included in the divided area; identifying, from among a plurality of pixels included in the image data, a target pixel based on a color value of the target pixel; and replacing the color value of the identified target pixel with a target color when a condition based on the color value of the identified target pixel and a color value of the target color is satisfied, the target color being the candidate color closest to the color value of the target pixel among the plurality of candidate colors registered in the storage.