GIMP is an advanced picture editor. You can use it to edit, enhance, and retouch photos and scans, create drawings, and make your own images. Lots of tools are available; you can sharpen and resize photos, and remove dust and red-eyes, for example.
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To install Gimp open your Ubuntu Software Center by pressing Alt+F2 and type: software-center. Type gimp in the search field and select the search result. Now click on the More Info button to add some useful add-ons to install. When the add-ons you want to install are selected click on the Install button to install Gimp and the add-ons. When the installation is finished you can close the Ubuntu Software Center. To start Gimp press Alt+F2 and type: gimp.
Gimp has a large collection of professional-level editing tools and filters, similar to the ones you might find in PhotoShop. Numerous fine-control settings and features like layers, paths, masks, and scripting give you total control over your images. Many image file formats are supported, including JPEG, PhotoShop (.psd), and Paint Shop Pro (.psp) files. It can also be used to scan and print photos.