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.
snapscreenshot takes a screenshot from a single Linux virtual console (tty) or from a group of ttys. It does not care if it is a plain text mode or framebuffer console; it only needs read-access to /dev/vcsa* -devices. The program outputs a tga file to stdout; use an image manipulation program to convert it to png or whatever you prefer.