The lensfun library not only provides a way to read the database and search for specific things in it, but also provides a set of algorithms for correcting images based on detailed knowledge of lens properties. Right now lensfun is designed to correct distortion, transversal (also known as lateral) chromatic aberrations, vignetting and colour contribution of the lens (e.g. when sometimes people says one lens gives yellowish images and another, say, bluish).
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