Are you looking for a Free Photoshop alternative software, where you can create, edit and save your images professionally.
If you are not at all interested in purchasing Adobe Photoshop, and want to have such type of environment, not exactly the same but, if you want to have a good alternative and free software where you can create and edit the images, make them animated like gif etc., and reuse the images with editing mode like text editing, layers addition etc., then The GIMP is a good solution for you.
GIMP aka GNU Image Manipulation Program is a free image manipulation and good photoshop alternative software available for Windows, Linux (Ubuntu, Debian, Fedora etc.) etc.. Through GIMP, you can have tasks as photo retouching, image composition and image authoring.
Download & Install The GIMP
To download and install GIMP, and have more detailed information related to this freely available software, visit its official website at:
GIMP – The GNU Image Manipulation Program
Also check out the following post, where you can have a list of different Software for Ubuntu for free at:
Software For Ubuntu