Image forming apparatus

An image forming apparatus comprising:

• an image forming portion configured to form an image on a recording material;
• a fixing portion including a cylindrical heat transfer member and a heating member contacting an inner surface of said heat transfer member and a pressing member for forming a nip in which said pressing member nips and feeds the recording material in a cooperation with said heating member through said heat transfer member, and configured to fix the image on the recording material by heating the image-formed recording material by heat from said heating member through said heat transfer member;
• and
• a control unit configured to control a target temperature of said heating member,
• wherein for a plurality of pixels, of image data corresponding to the image to be formed on the recording material, in each interval corresponding to a circumferential length of said heat transfer member with respect to a recording material feeding direction, said control unit acquires a first number of pixels for forming an image with a predetermined density or more, and
• for a plurality of pixels, of an image which has already been printed on a side of the recording material opposing said pressing member, in each interval corresponding to a circumferential length of said pressing member with respect to the recording material feeding direction, said control unit acquires a second number of pixels for forming an image with a predetermined density or more, and
• said control unit sets the target temperature depending on the first number and the second number.