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being extracted from the image in different ways. To pull a key successfully, though, you must
connect the image you want to key to the “Input” input.
A MediaIn node connected to the main “Input” input of a DeltaKeyer node;
other nodes are connected to specific inputs for those particular nodes.
If you position your pointer over any node’s input or output, a tooltip appears in the Tooltip bar
at the bottom of the Fusion window, letting you know what that input or output is for, to help
guide you to using the right input for the job. If you pause for a moment longer, another tooltip
appears in the Node Editor itself.
The node input’s tooltip in the Tooltip bar (left), and the node tooltip in the Node Editor (right).
Connecting to the Correct Input
When you’re connecting nodes, pulling a connection line from the output of one node and
dropping it right on top of the body of another node makes a connection to the default input for
that node, which is typically the “Input” or “Background” input.
Side by side, dropping a connection on a node’s
body to connect to that node’s primary input.
However, if you drop a connection line right on top of a specific input, then you’ll connect to that
input, so it’s important to be mindful of where you drop connection lines as you wire up different
node trees together.
Chapter – 69 Understanding Image Channels 1387