1. An image processing apparatus comprising: at least one processor; and a memory, wherein the at least one processor is configured to function as: an obtaining unit that obtains determination information to determine a degradation characteristic of sharpness of an image formed by an image forming apparatus; a first selection unit that selects one of a plurality of recovery processing parameters used to recover sharpness of an image, based on the determination information, characteristics of the plurality of recovery processing parameters being different from each other; and a recovery unit that performs recovery processing of sharpness on image data using the selected recovery processing parameter, wherein in a case when the degradation characteristics of sharpness are substantially the same in a low frequency range of the image, the same recovery processing parameter is selected, and wherein a common recovery processing parameter is assigned to a plurality of determination information items that is registered to a table and to which it has been determined that the degradation characteristics of sharpness are substantially the same, the table indicating correspondence between the determination information and the plurality of recovery processing parameters.