1. An image encoding method comprising: (a) performing predictive encoding on a pixel block having a predetermined size of a first color component image of an input image including a plurality of component images; (b) reconstructing the predictive-encoded pixel block of the first color component image; and (c) predicting a corresponding pixel block of a second color component image using pixel values of a reconstructed neighbor pixel block of the first color component image, pixel values of a reconstructed neighbor pixel block of the second color component image, and pixel values of the reconstructed pixel block of the first color component image.