Image forming apparatus and image forming method

An image forming apparatus comprising:

• image changing means for changing a plurality of partial images in a target image into a certain state, the target image being to be formed on a recording medium, the plurality of partial images being to be formed peripheral to a plurality of pattern images, and each of the plurality of partial images being to be formed at a certain position on the recording medium;
• image forming means for forming the target image including the changed plurality of partial images and the plurality of pattern images on the recording medium;
• and
• position correcting means for correcting a position of the target image based on a detection result of the formed plurality of pattern images.

An image forming method comprising:

• changing a plurality of partial images in a target image into a certain state, the target image being to be formed on a recording medium, the plurality of partial images being to be formed peripheral to a plurality of pattern images, and each of the plurality of partial images being to be formed at a certain position on the recording medium;
• forming the target image including the changed plurality of partial images and the plurality of pattern images on the recording medium;
• and
• correcting a position of the target image based on a detection result of the formed plurality of pattern images.