Image forming apparatus

An image forming apparatus, comprising:

• a movable image bearing body;
• image forming means for forming a developer image on the image bearing body;
• transferring means for transferring the developer image formed on the image bearing body toward a moving transferring medium;
• and
• control means for controlling the image forming means to form an image based on a dot pattern signal comprising a dot signal having information of a predetermined density, over a normal image forming area on the image bearing body plus an area being further downstream therefrom in the movable image bearing body travel direction,
• wherein the control means controls the image forming means so as to:
• form a dot pattern image based on the dot pattern signal regarding the area being further downstream from the normal image forming area;
• form a composite image from a normal image signal and the dot pattern signal regarding the normal image forming area;
• and
• form dot images, regarding a dot area where the normal image signal and the dot signal are overlapped with each other, with a density determined on the basis of a relationship between density information of the normal image signal and information of the predetermined density, on the dot area.