There is a market of at least 1, me, for a graphics editor that a smart (I understand the nature of graphics files), but non-trained (in photoshop) person can u

There is a market of at least 1, me, for a graphics editor that a smart (I understand the nature of graphics files), but non-trained (in photoshop) person can use. I've tried pixelmator a few times, but I have absolutely no idea how to use the damned thing. It looks simple enough. Yesterday, I opened an image and simply wanted to double the width, keeping the gradient "in tact". I couldn't even figure out how to select the area I needed (which was the whole of the image on the canvas). So how about a "photoshop for programmers"?