Image forming apparatus

An image forming apparatus comprising:

• a first image forming unit configured to form a first image of a chromatic color on a first image bearing member;
• a second image forming unit configured to form a second image of an achromatic color on a second image bearing member;
• an intermediate transfer member onto which the first image formed on the first image bearing member and the second image formed on the second image bearing member are to be transferred;
• a transfer unit configured to transfer an image transferred onto the intermediate transfer member onto a sheet;
• a fixing unit configured to fix the image transferred onto the sheet to the sheet;
• a reading unit configured to read the image fixed to the sheet;
• a switching unit configured to switch a first mode and a second mode, the first mode being a mode in which the intermediate transfer member and both the first image bearing member and the second image bearing member are in a contact state, and the second mode being a mode in which the first image bearing member and the intermediate transfer member are separated and the second image bearing member and the intermediate transfer member are in a contact state;
• and
• a controller configured to perform, in a case where an adjustment image for adjusting an image forming position is fixed to the sheet and the adjustment image fixed to the sheet is read by the reading unit, a determining process to determine a correction value for correcting the image forming position based on a reading result of the reading unit,
• wherein the controller is configured to form, in a case where the controller is set to form the second image without forming the first image and the controller is set to perform the determining process, the second image in the first mode.