It has many capabilities. It can be used as a simple paint program, an expert quality photo retouching program, an online batch processing system, a mass production image renderer, an image format converter, etc.
GIMP is expandable and extensible. It is designed to be augmented with plug-ins and extensions to do just about anything. The advanced scripting interface allows everything from the simplest task to the most complex image manipulation procedures to be easily scripted.
One of The GIMP's strengths is its free availability from many sources for many operating systems. Most GNU/Linux distributions include The GIMP as a standard application. The GIMP is also available for other operating systems such as Microsoft Windows™ or Apple's Mac OS X™ (Darwin). The GIMP is a Free Software application covered by the General Public License.
Note:- This procedure worked on my ubuntu hardy machine so i am not guarantee that this procedure will work for you.
If you want to know what is new in gimp 2.6 check here
Install Gimp 2.6.1 in Ubuntu hardy
You need to edit the source list file
gksudo gedit /etc/apt/sources.list
add the following line
deb http://ubuntu.org.ua/ getdeb/
Save the file and exit.
Now you need to update the source list using the following command
sudo apt-get update
Install gimp using the following command
sudo apt-get install gimp
This will update your GIMP 2.4 to GIMP 2.6.1
Checking your gimp version
Go to Applications--->Graphics--->GIMP Image Editor
Gimp 2.6.1 is loading
Gimp version details