Phototonic is an image viewer and organizer with the following features: * Light weight with a smooth and clear user interface * Does not depend on any desktop environment * Supports several customized thumbnail layouts * Load thumbnails and browse images recursively * Dynamic thumbnails loading, enabling fast browsing of very large folders * Filter thumbnails * Image navigation and file management * Slide show * View random image * Transformation: rotation, flipping, cropping, image mirroring * Adjust image colors * Keep transformations zoom and colors while browsing multiple images * Extensive automatic and manual zoom options * Supported image formats: BMP, GIF, ICO, JPEG, MNG, PBM, PGM, PNG, PPM, SVG, SVGZ, TGA, TIFF, XBM, XPM * Supports GIF animations * Keyboard shortcuts and mouse behavior customization * Load image files or folders from command line * Open images with external applications