Image forming apparatus

An image forming apparatus comprising:

• an image bearing member configured to carry and convey an image;
• a first image forming unit configured to form a first image in a first color on the image bearing member;
• a second image forming unit configured to form a second image in a second color different from the first color on the image bearing member;
• a measurement unit configured to detect positions of measurement images formed on the image bearing member by the first image forming unit and the second image forming unit;
• a correction unit configured to correct a position of the first image and a position of the second image based on the positions detected by the measurement unit;
• a detection unit configured to detect a temperature of the image forming apparatus;
• and
• a determining unit configured to determine timing for causing the first image forming unit and the second image forming unit to form the measurement images based on the temperature detected by the detection unit,
• wherein the timing determined by the determining unit includes:
• a first timing for the first image forming unit and the second image forming unit to form the measurement images prior to the first image forming unit and the second image forming unit forming an image according to a print instruction, and
• a second timing for the first image forming unit and the second image forming unit to form the measurement images after the first image forming unit and the second image forming unit formed the image according to the print instruction.