1. An image processing apparatus comprising: an image acquiring unit configured to acquire a face image, which is an image including a face of a person; a lip extracting unit configured to extract a lip region, which is a region corresponding to a lip, from the face image; a representative-color determining unit configured to determine a representative color of the lip on the basis of pixels included in the lip region; a value acquiring unit configured to acquire, for each pixel included in the face image, a first value representing a proximity to the lip region and a second value correlated to similarity of a color to the representative color; a lip-correction-map generating unit configured to generate, on the basis of distributions of the first values and the second values, a lip correction map representing a distribution of weights used in correcting a color of the lip included in the face image; and an image correcting unit configured to correct the color of the lip included in the face image using the lip correction map.