Image-processing apparatus, image-processing method, and image-processing program

Provided is an image-processing apparatus including: a total-pixel-value calculating portion that calculates sums of values of pixels arrayed in a first and second direction on either side of a pixel-of-interest; and an occurrence-origin detecting portion that detects the pixel-of-interest as an occurrence origin of on-axis chromatic aberration where a magnitude relationship between the sum of G values and that of R values of the pixels arrayed in the first direction is inverted with respect to a magnitude relationship between the sum of G values and that of R values of the pixels arrayed in the second direction or where a magnitude relationship between the sum of the G values and that of B values of the pixels arrayed in the first direction is inverted with respect to a magnitude relationship between the sum of the G values and that of B values of the pixels arrayed in the second direction.