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Click the Load All Timelines button to start the analysis.
Adding and Removing External Mattes
If you’ve been provided with matte files to accompany one or more media files used by a program you’re grading, you can attach them directly to specific clips in the Media Pool, in order to use them as key sources for a Clip Grade in the Node Editor of the Color page. You can even use matte files that pack multiple mattes within a single piece of media. This can be done by either writing different mattes to each of the red, green, and blue channels of a clip, or by embedding multiple matte passes within a single OpenEXR file.
Matching RGB and Matte images
When the Media Pool is in Icon view, clips with clip mattes appear with a badge.
A clip matte, seen in Icon view