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The initial node tree of the three clips we turned into a Fusion clip.
With this node tree assembled to mimic the video layers, we can focus the rest of this example
on adding the nodes we’ll need to each branch of this tree to create the green-screen
composite.
Pulling a Green-Screen Key Using the Delta Keyer
To make this composite, you need to create transparency behind the newscaster. When
working in a node tree, you must become accustomed to rearranging existing nodes to make
room for new ones. You’ll often move nodes off to the side or up above to make room for the
additional nodes.
Creating space after the MediaIn nodes and selecting the
second one in preparation for adding a node.
The DeltaKeyer node is the main tool used for green-screen keying. It attaches to the output of
the node that represents the green screenin our example, that is the MediaIn2 node. With the
MediaIn2 selected, pressing Shift-Space opens the Select Tool dialog where you can search for
and insert any node. Below we have added the DeltaKeyer after the MediaIn2 node but prior to
being merged with the background.
Adding a DeltaKeyer node inline after the MediaIn2 node.
The DeltaKeyer node is a sophisticated keyer that is capable of impressive results by combining
different kinds of mattes and a clean-plate layer, but it can also be used very simply if the
background that needs to be keyed is well lit. And once the DeltaKeyer creates a key, it
embeds the resulting alpha channel in its output, so in this simple case, it’s the only node we
need to add. It’s also worth noting that, although we’re using the DeltaKeyer to key a green
screen, it’s not limited to keying green or blue only; the DeltaKeyer can create impressive keys
on any color in your image.
Chapter – 70 Compositing Layers in Fusion 1425