Image forming apparatus with effective measure for restoring image quality

An image forming apparatus comprising:

• a processor, configured to:
• if there is a shortage of storage capacity for image information necessary to perform image formation, execute the image formation at a reduced image quality below a required image quality;
• and
• inform that image formation has been executed at a reduced image quality, and inform an effective measure in response to the image formation being executed at the reduced image quality to enable image formation that does not involve a reduction in image quality, wherein the effective measure is based on current storage capacity and storage capacity for image information to enable the image formation that does not involve the reduction in image quality, and wherein the effective measure includes at least one of making a setting change to storage capacity allocation and increasing storage capacity.