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1 Select a clip in the Media Pool to which you want to attach an external matte.
2 Select the matching external matte file in the Media Storage panel, right-click it, and choose Add to Media Pool as a Matte.
The matte is attached to the clip as a clip matte. A badge indicates that clip has a matte when the Media Pool is in Icon view, and the matte itself can be seen, if you put the Media Pool into List view, appearing as a nested item underneath the clip it’s attached to.
1 Put the Media Pool into List view.
2 Right-click the external matte file you need to remove, and choose Remove Selected Clips.
Removing an external matte clip also removes that matte’s key from any clip grades that use it, such that any clips using it as a key input change from a secondary operation to a primary operation, where the color adjustment affects the entire image.
1 Make sure no clip is selected in the Media Pool.
2 Select an external matte file in the Media Storage panel, right-click it, and choose Add to Media Pool as a Matte.
The external matte appears in the Media Pool as a timeline matte.
You can also assign mattes to clips directly in the Color page, which can sometimes be faster.
— Drag any clip from the Media Pool to the Node Editor.
That clip appears an an External matte for the current clip’s grade in the Node Editor, and it’s also automatically assigned to the current clip in the Media Pool.
For more information on using external matte clips as keys when grading, see Chapter 143, “Combining Keys and Using Mattes.”
Using Embedded Mattes in OpenEXR Files
If you’re importing OpenEXR files with embedded matte passes, there’s nothing special you need to do, as the mattes are within the clip you’ve just imported into the Media Pool. For more information on how to use mattes within OpenEXR files, see Chapter 143, “Combining Keys and Using Mattes.”