GIMP is an acronym for GNU Image Manipulation Program. It is a freely distributed program for such tasks as photo retouching, image composition and image authoring. 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.

Here are some key features of "The GIMP":

Painting:
· Full suite of painting tools including Brush, Pencil, Airbrush, Clone,
· etc.
· Sub-pixel sampling for all paint tools for high quality anti-aliasing
· Extremely powerful gradient editor and blend tool
· Supports custom brushes and patterns
System:
· Tile based memory management so image size is limited only by available disk space
· Virtually unlimited number of images open at one time
Advanced Manipulation:
· Full alpha channel support
· Layers and channels
· Multiple Undo/Redo (limited only by diskspace)
· Editable text layers
· Transformation tools including rotate, scale, shear and flip
· Selection tools including rectangle, ellipse, free, fuzzy and intelligent
· Advanced path tool doing bezier and polygonal selections.
· Transformable paths, transformable selections.
· Quickmask to paint a selection.
Extensible:
· A Procedural Database for calling internal GIMP functions from
· external programs as in Script-fu
· Advanced scripting capabilities (Scheme, Python, Perl)
· Plug-ins which allow for the easy addition of new file formats and new
· effect filters
· Over 100 plug-ins already available
Animation:
· Load and save animations in a convenient frame-as-layer format
· MNG support
· Frame Navigator (in GAP, the GIMP Animation Package)
· Onion Skin (in GAP, the GIMP Animation Package)
· Bluebox (in GAP, the GIMP Animation Package)
File Handling:
· File formats supported include bmp, gif, jpeg, mng, pcx, pdf, png, ps, psd, svg, tiff, tga, xpm, and many others
· Load, display, convert, save to many file formats
· SVG path import/export

All of the above, the compatibility with the graphics formats BMP, GIF, JPG, PCX, PNG, PS, TIF, TGA, XPM, among others, including more than 100 free plugins and is making this program an alternative to GIMP enshrined as Photoshop.

Extract and run GIMPPortable.
Copy additional fonts in GlMPPortable\App\GIMP\etc\fonts\
If you drag'n drop a file on (or open with) GIMPPortable: it will be opened in GIMP.
Settings of installed GIMP should be preserved

GIMP 2.6.12 Released - The Final 2.6 Release (2012-02-01)
Overview of Changes from GIMP 2.6.11 to GIMP 2.6.12
* Bugs fixed:
- GIMP 2.6.10 segfaults when CTRL-left click on a layer mask
- GIMP fails to import a path from SVG
- Crash or Gtk-CRITICAL on File->Open
- [abrt] gimp-2:2.6.11-1.fc14: py-slice.py:172:slice:TypeError: integer argument expected, got float
- gimp(1) manpage fixes
- Sample Colorize does not function non-interactively
- file-pdf-load: Don't use deprecated API
- file-psp: fix for bogus input data
- Fixes for some buffer overflow problems
- Guard against crash due to quitting while DND is processed
- fails to build with -Werror=format-security
- script-fu: make server IPv6 aware
... plus a ton of others.
* Updated translations: Asturian (ast), Catalan (Valencian), Danish (da), Greek (el), Esperanto (eo), Spanish (es), Italian (it), Japanese (ja), Kazakh (kk), Latvian (la), Norwegian Nynorsk (nn), Polish (pl), Portuguese (pt), Brazilian Portuguese (pt_BR), Russian (ru), Turkish (tr), Simplified Chinese (zh_CN)