You do not have to buy Photoshop inorder to use all its functionalities. Yes. There is an absolutely Free software called Gimp that offers an amazing range of image proccessing and manipulation tools. I am not a professional graphist, so I have never used photoshop in its full capacity, but I have explored and used many of its more advanced features, and I can tell you that I have found nothing that Photoshop can do but Gimp can’t.
Like most other free softwares, Gimp was originally designed for the Linux operating system and was released under the GNU General Public License. However, my favorite thing about Gimp is that Windows and MacOS versions have also been produced and are available for Download for free. The Linux, Mac OSx and Windows downloads may b found on the following page:
Navid, many thanks for suggesting it. I was looking for something like that.