Types Of Mattes; Background Matte - Blackmagic Design Ultimatte 12 Manual De Operaciones

An example of a final output comprised of background, foreground and layers composited together

Types of Mattes

Different matte types are used for specific purposes to separate areas of the corresponding
image into foreground and background elements, or to include or exclude sections of the matte
you want to keep or discard.
Below is a description of the types of mattes used.

Background Matte

The background matte lets you extract a section from the background and place it over
the foreground.
For example, you may have a virtual set as your background image that has a partition on one
side. Using a background matte that precisely matches the partition in your virtual set, you can
extract the partition from the background and the talent can walk behind it. This is an excellent
way to create a foreground element using the background image and keeps the layer input free
for additional foreground items. It's important to note that elements to be extracted from the
background must be completely opaque.
What is a Matte? 7