1. A method of enhancing a resolution of an image by fusing images, the method comprising: applying a principal component analysis to a multispectral image to obtain a plurality of principal components; replacing a first component in the plurality of principal components by a panchromatic image; resampling remaining principal components to a resolution of the panchromatic image; and applying an inverse principal analysis to the panchromatic image and the remaining principal components to obtain a fused image of the panchromatic image and the multispectral image.