Image Viewer is a multi-frame (animated) image viewer with real-time interactive pan and zoom viewing that uses the GTK+ toolkit and Imlib. It is capable of opening and saving to any image format supported by Imlib. It features screenshots (screen capture), crop, resizing, print, fullscreen display, display on the desktop (root window), animation (creating animated GIFs), color leveling, drawing font/text strings, and editing image header information.
pad sequential filenames so alphabetical order matches numerical order. It automatically determines the necessary integer field width, treats filenames with different prefixes or suffixes separately, removes redundant padding, and is reasonably efficient, even for thousands of names.