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To use a clip matte to limit an adjustment within a Clip grade:
1 Right-click any node, and choose the attached matte you want to use from the Add Matte
submenu of the contextual menu.
By default, the EXT MATTE node that appears has its first output connected to the Connect one of
the EXT MATTE node’s triangular key outputs to the key input of a node you want it to limit.
2 Select the node to which the EXT MATTE node is attached, and add an Outside node to make it
possible to add adjustments on either side of the matte.
Node Editor displaying the influence of the external
matte on multiple nodes when the keys are linked
3 If necessary, select Node 1, and use the Key palette controls to modify the incoming key, inverting
or blurring it as necessary to create the isolation you need.
NOTE: Don’t select the EXT MATTE node, because it exposes different controls in the
Key palette for transforming, flipping, looping, and freezing the matte.
At this point, you can add adjustments to the inside and the outside of this composited shot to
improve the composite.
(Before/After) An external matte is used to apply separate grades to the
foreground and background of a previously composited clip
Ideally, external mattes are exported so that they match the size and duration of the RGB clip
they’re supposed to accompany. If they don’t match or if you’re using some other grayscale clip as
an external matte to create some sort of effect, then there are parameters in the Key palette that
you can use to retime or transform a matte so it works better in your grade.
To slip the sync of a matte relative to the clip it’s attached to:
1 Select the Ext Matte node you want to slip.
2 Open the Key palette, and turn off the Lock Matte checkbox.
Chapter 142Combining Keys and Using Mattes 2810
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