Image formation control method and image forming apparatus

An image formation control method for controlling an image forming apparatus including:

• a printing device configured to form an image on a sheet by ejecting ink;
• and a drying device including a temperature detection device and a heater whose power supply is adjusted by feedback control based on a target temperature set for each job for sequentially forming images on a plurality of sheets and a temperature detected by the temperature detection device and configured to dry the ink on the sheet by the heater, the image formation control method comprising:
• by a control device, setting the target temperature corresponding to the job and causing the printing device to execute the job when a request for the job is input while the printing device is not operating;
• by the control device, executing first insertion control of, when an insertion event occurs in which a predetermined insertion condition is satisfied while the printing device is executing the job, causing the printing device to interrupt a target job which is the job being executed, causing the printing device to execute a test print process of forming a predetermined image on one or more of the sheets without changing the target temperature, and then causing the printing device to execute a remaining process of the target job;
• and
• by the control device, executing interrupt control of, when an interrupt event occurs in which a request for an interrupt job which is a new job is input while the target job is being executed, causing the printing device to interrupt the target job, changing the target temperature to a temperature corresponding to the interrupt job, and causing the printing device to execute the interrupt job, and then returning the target temperature to the temperature corresponding to the target job, and causing the printing device to execute the remaining process of the target job.