PixelNhance, from Caffeine Software, is a real-time image enhancement application that lets you quickly and easily determine the best image adjustment settings for your image. For example, you can open up a document in PixelNhance and find the optimal sharpness for that image in a matter of seconds. Your image appears in a unique split-screen window with the original settings on one side and the settings that you are currently have in the Controls window on the other. You can horizontally, vertically, or diagonally move, as well as rotate, the dividing bar that separates the two regions. Best of all, it’s freeware. More info and download link here.