The following list is a short overview of some of the features and capabilities which GIMP offers you:
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A full suite of painting tools including brushes, a pencil, an airbrush, cloning, etc.
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Tile-based memory management, so image size is limited only by available disk space
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Sub-pixel sampling for all paint tools for high-quality anti-aliasing
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Full Alpha channel support for working with transparency
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Layers and channels
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A procedural database for calling internal GIMP functions from external programs, such as Script-Fu
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Advanced scripting capabilities
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Multiple undo/redo (limited only by disk space)
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Transformation tools including rotate, scale, shear and flip
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Support for a wide range of file formats, including GIF, JPEG, PNG, XPM, TIFF, TGA, MPEG, PS, PDF, PCX, BMP and many others
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Selection tools, including rectangle, ellipse, free, fuzzy, bezier and intelligent scissors
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Plug-ins that allow for the easy addition of new file formats and new effect filters.
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How to Install
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1) Run .exe
2) Follow Easy Install Steps
3) Run From Desktop Icon
4) Done
Most often, you start GIMP either by clicking on an icon (if your system is set up to provide you with one), or by typing gimp on a command line. If you have multiple versions of GIMP installed, You can, if you want, give a list of image files on the command line after the program name, and they will automatically be opened by GIMP as it starts. It is also possible, though, to open files from within GIMP once it is running.
Most operating systems support file associations, which associates a class of files (as determined by their filename extension, such as .jpg) with a corresponding application (such as GIMP). When image files are properly “associated” to GIMP, you can double click on an image to open it in GIMP.