Undeniably Photoshop is a class of its own when comes to photo editing. Of course some people might disagree and suggest Fireworks or Paintshop Pro. Among these, there is also an open source alternative – GIMP .
GIMP is an Open Source photo editing software like Photoshop. Over the years GIMP had evolved and matured into an application that can rival Photoshop in functionalities.
GIMP is acronym for GNU Image Manipulation Program. As the name suggests it can be used for such tasks as photo retouching, image composition and image authoring.
GIMP is a big program with many powerful functions. That means it will take time to learn . However as you spend time, you will discover that it does not take any more time compared to learning a commercial software like Photoshop.
Of course for someone already familiar with Photoshop, many things had to be learn, unlearn and relearn. For me it is the keyboard shortcut keys and the multi-windows interface.