Image forming apparatus and control method thereof

An image forming apparatus comprising:

• an image forming unit configured to form a measurement image on a recording sheet by using a color material;
• a fixing unit configured to fix the measurement image onto the recording sheet by heating the measurement image;
• a measurement unit configured to measure color values of the measurement image fixed on the recording sheet downstream of the fixing unit in a sheet conveyance direction of the recording sheet;
• a pressing member configured to press the recording sheet, on which the measurement image is formed, against the measurement unit;
• a selection unit configured to select a mode from among a first mode, in which the measurement image is measured with the pressing member pressing the recording sheet against the measurement unit, and a second mode, in which the measurement image is measured without the pressing member pressing the recording sheet against the measurement unit;
• and
• a control unit configured to cause the measurement unit to measure the color values of the measurement image in the mode selected by the selection unit.