ABSTRACT
The mask is the one odd man out. It is used to limit an image processing operation and can be created by the compositor in any number of ways. It might be a hand-drawn shape, a luma-key, or an imported image. However, one could always use the alpha channel to mask off an area of the screen, or a mask may be drawn by hand, and then used as the matte in a composite. Just when you thought it was getting clear! Anyway, let us take a look at a variety of methods of creating masks for isolating objects of interest.
