ABSTRACT
The primary focus of the Matte effects is transparency; or more specifically, the alpha channel of a layer. They are usually used in conjunction with keying or rotoscoping. The Matte effects restore holes in a layer (typically caused by keying), and can also eat away at the edges of a layer. The Matte Choker effect is used to both spread and choke a matte. The Refine Matte effect is simply the best matte refinement tool that exists in After Effects. It’s almost magical what it can do to a key, including removing a background from a moving subject with motion blur. The Simple Choker appears to round and soften the matte edge slightly already. The Simple Choker effect also smoothes the matte in addition to spreading or choking it. In many cases, that can be a detriment as corners get rounded.
