Image forming apparatus

An image forming apparatus comprising:

• a developing agent accommodating unit configured to accommodate a developing agent;
• a developing roller accommodating unit including a developing roller that develops an electrostatic latent image formed on a photosensitive member, and having an opening of a length smaller than a length of the developing roller in a direction of an axis of rotation of the developing roller, the developing roller accommodating unit configured to accommodate the developing agent supplied from the developing agent accommodating unit through the opening;
• an image formation control unit configured to receive a print job including information on a number of pixels in an image to be formed on a recording material and execute an image formation operation based on the print job;
• a replenishment operation determination unit configured to determine to perform a replenishment operation in a case where a predetermined condition is satisfied, the replenishment operation being an operation of supplying the developing agent from the developing agent accommodating unit to the developing roller accommodating unit;
• and
• a pixel number determination unit configured to determine, based on the information, a number of pixels in both a first area and a second area, each being a part of an image formation area of the recording material and being obtained by dividing the image formation area in the direction of the axis of rotation,
• wherein in a case where the number of pixels in the first area determined by the pixel number determination unit is taken as a first number of pixels and the number of pixels in the second area determined by the pixel number determination unit is taken as a second number of pixels, the predetermined condition is at least one of that the first number of pixels is greater than a first threshold and that the second number of pixels is greater than a second threshold different from the first threshold.