Image forming apparatus

An image forming apparatus, comprising:

• an image bearing member;
• a developer bearing member configured to transport developer to an electrostatic latent image formed on the image bearing member based on image data;
• a supply roller including a foam elastic member configured to come into contact with the developer bearing member to supply, to a surface of the developer bearing member, the developer charged to a normal charging polarity;
• a power source device configured to apply a developing voltage to the developer bearing member and apply a supply voltage to the supply roller;
• an acquisition unit configured to acquire, for each of a plurality of regions on the image bearing member in a rotation direction of the image bearing member, information regarding a print-pixel area obtained from the image data;
• and
• a control unit configured to control supply of the developer from the supply roller to the developer bearing member by controlling the developing voltage and the supply voltage,
• wherein the control unit is configured to control an image forming operation in which an image formed of the developer on the surface of the image bearing member is produced and then printed on a recording material, and
• when executing the image forming operation for one sheet of the recording material, in a case in which, among the plurality of regions on the image bearing member, a second region having a second print-pixel area that is smaller than a first print-pixel area is formed after a first region having the first print-pixel area, the control unit controls the supply voltage so that the supply voltage is continuously increased toward the normal charging polarity from the first region to the second region, and an increase amount per unit length in the rotation direction of the image bearing member of the supply voltage within the first region is greater than an increase amount per unit length in the rotation direction of the image bearing member of the supply voltage within the second region.