Decompose scores over Photoshop by having a brush to define the transitional edge ares where pixels may be foreground image or background. Rather than having to perform a very accurate selection, cut it out and then perform a lot of smoothing of the edges, in Decompose you make a quicker, broad-brush selection of the edge area, from which the app. calculates the border, removes the background to transparency and gives a smooth edge. It seems to work well even if there isn't a lot of contrast between foreground and background. Well worth the money to save time and effort -- and if you need to make good quality, foolproof cut-outs in a hurry, you'll thank the developers. It could do with some sensitivity controls, and a grab tool with a spacebar shortcut to navigate around the image, but this is only a v1.n and it lacks little in the way of refinement.