GThumb ignores images

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http://forums.fedoraforum.org – I have a fresh install of 64-bit Fedora 16. When I run GThumb, it does see my image files (JPG and PNG), but it always shows them as small icons, even if I double click on them. In other words, it seems as though it does not know that these are image files. As an example, I expected that I could zoom in and out using +/-, nope. Is there another simple image viewer that does not try to import and catalog the images (as shotwell seems to do). I am trying to view transient images that will change and be removed frequently (I generate the images in perl scripts..... I look at them and then may (HowTos)