Image forming apparatus having plural image forming modes

An image forming apparatus that forms an image on a sheet based on an image forming mode, the image forming mode including a first image forming mode and a second image forming mode for forming an image having a maximum density different from a maximum density of an image in the first image forming mode, the image forming apparatus comprising:

• an image processor configured to convert an image signal based on a conversion condition;
• an image forming unit configured to form an image based on the image signal converted by the image processor, the image forming unit being controlled based on an image forming condition corresponding to the image forming mode;
• an image bearing member on which a pattern image is to be formed by the image forming unit;
• a sensor configured to detect the pattern image formed on the image bearing member;
• and
• a processor configured to:
• acquire data indicating a correlation between a first image forming condition for the first image forming mode and a second image forming condition for the second image forming mode;
• control the image forming unit to form a first pattern image;
• generate the first image forming condition based on a detection result of the first pattern image detected by the sensor;
• generate the second image forming condition based on the data and the detection result of the first pattern image detected by the sensor;
• control the image forming unit to form a second pattern image;
• and
• generate the conversion condition based on a detection result of the second pattern image detected by the sensor,
• wherein the image processor is configured to use the conversion condition in both of the first image forming mode and the second image forming mode.