I had high hopes for Photo Studio HD, a universal US$1.99 app that provides an extremely wide selection of tools to edit and enhance photos.
The problem is, I really couldn't import any pictures and truly improve them using the app. The issues started when I opened a landscape image with the result that it lost most of its resolution and looked blurry and blocky. Not good for an app that calls itself Photo Studio HD.
In addition, the app's editing tools are difficult to launch. When you swipe across the scrolling list, sometimes a tool near your finger opens, instead of the expected movement to the next tool.
The sharpen tool made my picture look much worse. Few of the tools are subtle, and they can give you a garish image whether you like it or not. Even selecting frames was an odd experience. Most of the frames are garish and over the top. I was looking for a simple white frame and a matte, but couldn't really find something I liked.
Some aspects of the UI are confusing. If I want to undo an action, for example, the app sometimes offers a yes/no option, other times it has a button marked 'proceed'. It's not clear if that means proceed with the undo, or proceed with the effect. Contrast that with the free Snapseed app, which was able to improve almost any photo I threw at it, with no loss of resolution or quality.
The app does have extensive help, which links to YouTube videos showing the filters and effects in action, but generally, I didn't like any of the effects. Worse, when I clicked the instructional video on saving a photo, it played a video designed for another app!