Photoshop is the worlds most popular image editing application. Its very hard to be a professional on the web and not have a good working knowledge of this tool. There are free alternatives like GIMP that can work in a pinch, but if you plan to make a living on the web you really need to invest in Adobe Photoshop if not the entire Creative Suite. I mean come on, the app is so popular it is now a verb “to Photoshop something”, and an adjective “that looks Photoshopped”.
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