We go much further. So far, we've talked about raw area selection capabilities. There are a number of modifiers which affect area selections, though, and this makes them even more flexible. It is designed to be easy to use and visually intuitive. There's more - a lot more.
Lets talk about alpha channels and transparency for a moment.
There is one more little detail we've been saving for last. Accordingly, the way it works is designed to let you apply effects as efficiently as possible. Lets say you're using the ellipse tool, and the contrast process. Drag out an ellipse, and the process runs immediately on the area when you let go the mouse. That's a very powerful way to work, and in fact it's a better way to work if the type of image editing you are doing is more touch-up or enhancement oriented.