This module uses the Image::Magick library to process an image on the fly. There is only one base image (in this case a JPG), but when you try to fetch the image with a different suffix, it will be automatically converted to the requested image format. You can specify image manipulation filters in the additional path info, and format options in the query string.
Try the precanned examples below. Then read the Image::Magick documentation and try a few new URLs for yourself! (hint: Image::Magick supports TIFF, PPM, PGM, PPB and even postscript formats)