1. An image processing apparatus for performing sharpness correction on input image data, comprising: extraction means for extracting lightness data and chromaticity data from the input image data; edge amount extraction means for extracting an edge amount on the basis of the lightness data; saturation extraction means for extracting a saturation component on the basis of the chromaticity data; distribution means for distributing an emphasis amount of an edge portion on the basis of the edge amount extracted by said edge amount extraction means to the lightness data and chromaticity data in correspondence with the saturation component extracted by said saturation extraction means; and edge emphasis means for correcting the lightness data and chromaticity data using the emphasis amount of the edge portion distributed by said distribution means.