Apparatus and method of apparatus

An apparatus comprising:

• a first acquisition unit configured to acquire information of an operation amount of a conveyance unit configured to convey a printing medium;
• a second acquisition unit configured to acquire information of a density of an image printed by a printhead;
• a correction unit configured to correct the information of the operation amount acquired by the first acquisition unit;
• and
• a specify unit configured to specify the density of the image based on histogram collection on the information of the density of the image acquired by the second acquisition unit,
• wherein the specify unit creates a histogram on the information of the operation amount acquired by the first acquisition unit, and decides a correction value of the information of the operation amount based on the created histogram, and
• the correction unit performs correction based on the correction value decided by the specify unit.