OpenEXR and External Mattes

You can create multi-channel OpenEXR files (multiple channels embedded in the OpenEXR file) that are displayed as multi-channel clips in Lustre. You can also use OpenEXR files with a matte / multimattes folder structure to automatically generate a multi-channel clip. When working with multi-channel OpenEXR files with an external matte / multimatte folder, you must always manually resync the cut / grade to have access to the matte channels. To do this:

1. Import your multi-channel OpenEXR clip.
Note: At this stage, only the embedded RGB mattes are available.
2. Save your cut/grade.
3. Press Shift on the keyboard and load your cut or your grade.

All embedded and external mattes are now available.

It is also possible to update clips when external mattes are added from the file system. When you import a clip (locally or via Wiretap Gateway), and Matte media has been added in the Matte or Multi Matte structure, you can hold Shift when loading a Cut or a Grade and the clips and cuts are updated to reflect the newly added channels. This enables the following operations:


• Converting regular clips to Multi-Channel clips.
• Adding/Modifying Multi-Channel clips (addition, modification or removal of channels).