The eBook to the freeware image viewer "Image Racer" from the "PRIMA"-series ((Private Informations Management) describes often with an example all available functions (software-release 4.0).   Behind a fast image showing and some basic functions there are some additional functions like cropping of a part of the image, a special slide show, upload images, play videos, support for panorama-views, encrypt/decrypt images and others.  Also: Scanner and camera support, Geomapping, editing of GPS coordinates, playing videos and much more.