Image forming apparatus and image forming method

An image forming apparatus comprising:

• a print processing portion configured to control an image forming portion including image forming units corresponding to a plurality of colors, and execute monochrome printing of forming a monochrome image on a sheet on a basis of input image data or color printing of forming a color image on the sheet on the basis of the input image data;
• and
• an adjustment processing portion configured to allow, in a case where a printing type of a print process to be executed by the print processing portion is changed from one of the monochrome printing and the color printing to another, a condition adjustment process of adjusting an image formation condition of the image forming portion to be executed before execution of the monochrome printing or the color printing subsequent to a change of the printing type, wherein
• the print processing portion allows line speed of the image forming portion to be changed depending on a combination of a line speed mode and the printing type set in advance in association with a sheet type of the sheet, and
• the adjustment processing portion allows execution of the condition adjustment process to be restricted in a case where the line speed mode is identical before and after a change of the printing type and a restriction condition set in advance is satisfied.