To provide an image processing apparatus capable of always providing a high image quality recording image. A storage unit stores pattern information used for recording a target image on a recording medium at the unit of a pixel by means of a plurality of recording elements provided on the individual of the recording head (a plurality of pattern information items about use/no use of each recording agent in the recording elements together with a reference information item for deciding the pattern information used in recording the target pixel corresponding thereto. A correction unit corrects the information in the storage unit on the basis of the measured result of the density of the given image (test pattern) recorded in advance on the recording medium.