1. An image processing apparatus comprising: a brightness extraction unit that extracts a brightness component from image data; a scale conversion unit that performs scale conversion to extract a low-frequency component of the extracted brightness component; a setting unit that sets a parameter to adjust a degree to which the image processing apparatus corrects the brightness component of the image data based on the brightness component of the image data in a face area of an input image corresponding to the image data; and a correction unit that correct the brightness component of the image data by using the low-frequency component of the brightness component and the parameter, wherein the correction unit corrects the brightness component of the image data based on the converted low-frequency component of the brightness component obtained by converting the low-frequency component of the brightness component by using the parameter.