Image forming apparatus that sets a target temperature based on a developer amount in a developer storage portion

An image forming apparatus comprising:

• an image forming portion including a developer storage portion configured to store developer, the image forming portion being configured to form an image on a recording material by using the developer;
• a fixing apparatus configured to fix the image to the recording material by heating the image;
• a detection portion configured to output a detection signal in accordance with a developer amount in the developer storage portion;
• and
• a control portion configured to control a target temperature of the fixing apparatus depending on the detection signal,
• wherein the developer storage portion is configured to be supplied with the developer from a supplying container that is outside the image forming apparatus, and
• wherein the control portion is configured to
• (i) set the target temperature at a first temperature if the developer amount is a first amount,
• (ii) set the target temperature at a second temperature lower than the first temperature if the developer amount is a second amount smaller than the first amount, and
• (iii) set the target temperature at a third temperature higher than the second temperature if the developer storage portion is supplied with the developer such that the developer amount is increased from the second amount to the first amount.