Image forming apparatus, control method thereof, and storage medium for correcting variations in light amount from light source

A control method of an electrophotographic image forming apparatus that utilizes a line head in which a plurality of light-emitting elements is arranged as a light source, the control method comprising:

• an obtaining step of obtaining print data for the electrophotographic image forming apparatus to perform printing;
• a halftone processing step of performing halftone processing for the obtained print data;
• a generation step of generating a plurality of pieces of correction information for correcting variations of light amount on a photosensitive body by light radiated from the plurality of light-emitting elements;
• and
• a correction step of correcting the print data for which the halftone processing has been performed by using the correction information, wherein
• the plurality of pieces of correction information includes a first profile for correcting the variations of light amount resulting from the light-emitting elements, a second profile for correcting the variations of light amount resulting from an individual difference of a current source of the light-emitting elements, and a third profile for correcting the variations of light amount resulting from a positional relationship between the line head and the photosensitive body.

A non-transitory computer readable storage medium storing a program for causing a computer to execute a control method of an electrophotographic image forming apparatus that utilizes a line head in which a plurality of light-emitting elements is arranged as a light source, the control method comprising:

• an obtaining step of obtaining print data for the electrophotographic image forming apparatus to perform printing;
• a halftone processing step of performing halftone processing for the obtained print data;
• a generation step of generating a plurality of pieces of correction information for correcting variations of light amount on a photosensitive body by light radiated from the plurality of light-emitting elements;
• and
• a correction step of correcting the print data for which the halftone processing has been performed by using the correction information, wherein
• the plurality of pieces of correction information includes a first profile for correcting the variations of light amount resulting from the light-emitting elements, a second profile for correcting the variations of light amount resulting from an individual difference of a current source of the light-emitting elements, and a third profile for correcting the variations of light amount resulting from a positional relationship between the line head and the photosensitive body.