One could also use the free Faststone Image Viewer
instead and not have any backround to deal with since it displays most images in fullscreen (with flyout menus that appear when one moves the cursor to the edges of the screen). It's nice, imo, to be able to view one's images in fullscreen without any borders or other clutter. If one makes Faststone the default image viewer, then anytime one clicks on an image file, it opens (fast) in fullscreen with Faststone. Also, one can still access and use other external editing programs (such as e.g., Picasa, LightRoom, Photoshop, etc.) from w/i Faststone.