When you load clips on the EditDesk into the Player, you can enable a letterbox overlay using the Player View options. This letterbox view option is saved with the clip. You can output the clip with the same letterbox setting.
You can apply a letterbox overlay on output. The letterbox does not affect the clip itself; it is applied on the fly as part of the real-time output process.
To output clips with a letterbox overlay:
(b) Letterbox aspect ratio field (c) Letterbox offset field (a) Colour selector box