IrfanView is a very fast, small, compact and innovative FREEWARE (for non-commercial use) graphic viewer for Windows. It is designed to be simple for beginners and powerful for professionals. IrfanView was the first Windows graphic viewer WORLDWIDE with Multiple (animated) GIF support, one of the first graphic viewers WORLDWIDE with Multipage TIF support and the first graphic viewer WORLDWIDE with Multiple ICO support.
This software was recommended by a friend as a light alternative to PhotoShop. I have so far not installed or tested it.