Bluescreen Matting

Now we know the basic idea and workflow of recomposition. It's obvious that most time are spended on extracting the subject and separating it from background(matting itself),and, the simple selection tool can only deal with simple shape. So, let's find out what 'Bluescreen matting' can do:

The bluescreen matting has been introduced in chapter 1, we select a photo meet all its requirements as sample of this toturial. This photo can be found in the 'sample' folder of your software.