Image forming method and image forming apparatus

An image forming apparatus comprising:

• a corona discharge treatment section that modifies a surface of a recording medium;
• an inkjet head having a nozzle face, on which an ejection port of a nozzle is provided, the nozzle being capable of ejecting droplets of an inkjet ink which contains a photocurable compound and a gelling agent having no polymerizable group and which undergoes temperature-induced sol-gel phase transition;
• a conveying section that conveys the recording medium at a position which is directly below, in a vertical direction, the ejection port of the nozzle of the inkjet head, so as to move the recording medium opposite to the inkjet head;
• an irradiation section that irradiates an upper face of the conveying section with actinic radiation from a light source;
• and
• a control section that controls the corona discharge treatment section, the inkjet head, the conveying section and the irradiation section;
• wherein the recording medium is a paper substrate, and the corona discharge treatment section performs a surface treatment of a paper substrate having a 60° gloss value of 5 or more and 50 or less.