Blackmagic Design DaVinci Resolve Advanced Panel - Manual (Page 213)

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You’ve already seen that you can import an external matte clip to use for isolating clips in Resolve.
Although DaVinci Resolve isn’t compatible with embedded alpha channels, if you’ve exported a clip’s
alpha channel as a separate matte clip, you can use that matte clip with a superimposed clip to create
an identical composite using the Alpha Output.
To create a composite using an external matte:
1. To associate an external matte with a clip, open the Browse page, select the clip
you want to add a matte to in the Media Pool, navigate to the matte file using the
Media Storage and Clip Details lists, and then right-click the matte file and choose
Add as Matte.
2. Open the Color page and select the foreground clip in the thumbnail timeline, then
right-click node 1 in the node graph and choose the matte you added from the Add
Matte submenu.
An EXT MATTE node appears underneath Node 1, with the first of its three Key outputs
connected to node 1’s Key Input. Working with external mattes is covered in more detail
in a prior section of this chapter.
3. Now, right-click anywhere within the node graph, other then on a node, and choose Add
Alpha Output from the contextual menu.
An Alpha Output bar appears underneath the Output bar.
An initial chroma key composite, ready for refinement