Yogi is a GTK based clens graphical frontend. Yogi is a GTK based graphical front end to the image corrector clens.
Clens utility is a command-line version of PTLens, an add-on for Panorama Tools that corrects for vignetting and lens pincushion and barrel distortion only available for Windows. Clens compares your JPEG images with a lens database and automatically corrects lens barrel distortion.
Yogi provide widgets for all command line options of clens, and display both the original photo and the processed one.