Image capturing apparatus and program

摘要

Shading occurring in an image captured by an image sensor has a characteristic in that the light amount decrease ratio is asymmetrical with respect to the center of the image and varies according to a color component. Consequently, three correction tables are generated in correspondence with three color component images of R, G and B which form a color un-corrected image. The correction tables have correction factors whose values are asymmetrical with respect to the center of an image. By using the dedicated correction tables for the three color component images of the un-corrected image, shading correction is made. Thus, shading in the un-corrected image is properly corrected.