[ubuntu] Specific image viewing app

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http://ubuntuforums.org – I am trying to find the lightest possible image viewing program to perform a very specific task (X Windows is fine). I have a large folder of images in various formats (jpg, png, gif). I want to view these images in a randomized order, either as a slideshow or scrolled through manually, with the animated gifs er, animating. Thoughts? (Hardware)