1. An image processing method, comprising: providing a source face image and a target face image; extracting a plurality of facial features from the source face image and the target face image respectively; generating a plurality of feature dimensions according to the facial features from the source face image and the target face image respectively; pairing the facial features from the source face image with the facial features from the target face image; and forming an output face image by adjusting the facial features from the source face image in at least one of the feature dimensions according to the paired features from the target face image in the corresponding feature dimensions.