Linux.com has a great roundup of cross-platform applications and GIMP plug-ins that can help make your not-so-great digital pictures into keepers. Among them is a free Java-based tool called Unshake, ...

Gimp is normally used to create or manipulate images files, but can also work with PDFs if you understand how it works and what it's limits are. If you’ve never used Gimp—a free image editor available ...